Test equipment workstations

Hewlett-Packard xw6400 Workstation: troubleshooting and error codes

The ServiceForge knowledge base holds 158 documented symptoms for the Hewlett-Packard xw6400 Workstation, with 272 ranked causes, 157 diagnostic checks with test points and expected values, and 79 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Sound does not come out of speaker or headphones

No audio output from speaker or headphones despite audio playback expected

Ranked causes

1. Software volume control turned down (common)
2. External speakers not turned on (common)
3. External speakers plugged into wrong audio jack (occasional)
4. Audio cable not connected (common)
5. Digital CD audio is not enabled (occasional)
6. Headphones or devices connected to line-out connector mute internal speaker (occasional)
7. Volume is muted (common)
8. Computer is in Standby mode (common)

8 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unable to connect to the Internet

System cannot establish connection to Internet service

Ranked causes

1. Internet Service Provider account not set up properly (occasional)
2. Modem not set up properly (common)
3. Web browser not set up properly (occasional)
4. Cable/DSL modem not plugged in (common)
5. Cable/DSL service not available or interrupted by weather (occasional)
6. CAT5 10/100/1000 cable disconnected (common)
7. IP address not configured properly (occasional)
8. Cookies corrupted (rare)

8 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Blank screen (no video)

Monitor displays nothing, workstation powered on

Ranked causes

1. Cable connections not correct (common)
2. Monitor is off (common)
3. Screen blanking utility or energy saver enabled (occasional)
4. System ROM is bad; FailSafe Boot Block mode active (rare)
5. Fixed-sync monitor incompatible with resolution (occasional)
6. Computer in Sleep/Standby mode (common)
7. Monitor settings incompatible with graphics card (occasional)

7 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Diskette drive cannot write to diskette

System cannot write data to a diskette; write operations fail

Ranked causes

1. Diskette is not formatted (common)
2. Diskette is write-protected (common)
3. Writing to the wrong drive (occasional)
4. Not enough space is left on the diskette (common)
5. Diskette write control is enabled (occasional)
6. Diskette is damaged (occasional)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

New device not recognized as part of system

Newly installed hardware is not detected or recognized by workstation

Ranked causes

1. Device not seated or connected properly (common)
2. Cables of new external device loose or power cables unplugged (common)
3. Power switch of new external device not turned on (occasional)
4. Configuration changes not accepted when prompted (occasional)
5. PnP board conflict with existing devices (occasional)
6. Device hardware not properly jumpered or otherwise configured (occasional)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

System does not power on

No Power LED indication; system fails to start

Ranked causes

1. AC power not available (common)
2. Power button harness disconnected (occasional)
3. Power supply cables disconnected (occasional)
4. Power supply failure (occasional)
5. Expansion card failure (rare)
6. System board failure (rare)

First check

Verify AC outlet power

Test point: AC outlet
Expected: Working AC power present
Tools: Power meter

3 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Diagnostics reports network failure

Network diagnostics test fails with error condition

Ranked causes

1. Cable not securely connected (common)
2. Cable attached to incorrect connector (occasional)
3. Problem with cable or remote device (occasional)
4. Network controller interrupt shared with expansion board (occasional)
5. Network controller is defective (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Keyboard commands and typing not recognized

Keyboard input is not responded to by workstation or active application

Ranked causes

1. Keyboard connector not properly connected (common)
2. Program in use has stopped responding to commands (common)
3. Keyboard needs repairs (rare)
4. Keyboard key is stuck down (occasional)
5. Workstation is in Sleep/Standby mode (occasional)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Thermal shutdown occurred caution

Power LED blinks red 2 times, 2 beeps; thermal protection activated

Ranked causes

1. Blocked air vents (common)
2. Cooling fan not running (common)
3. Processor fan not running (common)
4. Processor fan failure (occasional)
5. CPU heatsink improperly attached (occasional)

First check

Inspect air vents

Expected: Air vents clear and unobstructed
Tools: Visual inspection

3 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

USB device, headphone, or microphone not recognized

USB peripheral or audio device is not detected or recognized by workstation

Ranked causes

1. Device not properly connected (common)
2. Device does not have power (occasional)
3. Correct device driver not installed (common)
4. Cable from device to computer does not work (occasional)
5. Device is not working (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cannot boot to diskette

System will not boot from diskette drive

Ranked causes

1. Diskette is not bootable (common)
2. Diskette boot has been disabled in Computer Setup (common)
3. Removable media boot has been disabled in Computer Setup (occasional)
4. Diskette MBR validation is enabled (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Diskette drive cannot read diskette

Diskette drive cannot read data from a diskette; read operations fail

Ranked causes

1. Diskette is not formatted (common)
2. You are using the wrong diskette type for the drive type (occasional)
3. You are reading the wrong drive (occasional)
4. Diskette is damaged (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Diskette drive light stays on

Diskette drive activity LED remains illuminated continuously or abnormally

Ranked causes

1. Diskette is damaged (common)
2. Diskette is incorrectly inserted (common)
3. Files on diskette are damaged (occasional)
4. Drive cable is not properly connected (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Mouse does not respond to movement or is too slow

Mouse cursor does not move on screen or responds very slowly to mouse movements

Ranked causes

1. Mouse connector not properly plugged into back of workstation (common)
2. Program in use has stopped responding to commands (common)
3. Mouse needs repairs (rare)
4. Workstation is in Standby mode (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Network status link light does not illuminate or never flashes

No network activity indicator on the network adapter

Ranked causes

1. No active network detected (common)
2. Network controller not set up properly (occasional)
3. Network driver not properly loaded (occasional)
4. System cannot auto-sense the network (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Nonsystem disk/NTLDR missing message

System displays 'Nonsystem disk/NTLDR missing' error message; cannot boot

Ranked causes

1. System is trying to start from a non-bootable diskette (common)
2. System is trying to start from a damaged hard drive (common)
3. System files missing or not properly installed (occasional)
4. Hard drive boot disabled in Computer Setup (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pre-video graphic card error

Power LED blinks red 6 times, 6 beeps

Ranked causes

1. Integrated graphics system failure (occasional)
2. Graphic card not seated (common)
3. Graphic card failure (occasional)
4. System board defect (rare)

First check

Reseat graphic card

Expected: Graphic card fully seated in slot
Tools: Visual inspection

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pre-video memory error

Power LED blinks red 5 times, 5 beeps

Ranked causes

1. Memory not properly seated (common)
2. Faulty memory module (occasional)
3. Third-party memory incompatible (occasional)
4. System board defect (rare)

First check

Reseat memory modules

Expected: Memory modules fully seated and locked
Tools: Visual inspection

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Printer does not print

Printer does not produce any output despite print command sent

Ranked causes

1. Printer not turned on and online (common)
2. Correct printer driver for application not installed (common)
3. No connection made to network printer (occasional)
4. Printer might have failed (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

CD-ROM, CD-RW, DVD-ROM, or DVD-R/RW drive cannot read disc or takes too long

Optical drive fails to read media or shows excessive access time

Ranked causes

1. CD inserted upside down (common)
2. DVD-ROM requires time to determine media type (occasional)
3. CD or DVD disc is dirty (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Hard drive not found (identified)

Hard drive is not recognized or detected by the system

Ranked causes

1. Loose cable (common)
2. The system might not have automatically recognized a newly installed device (common)
3. Drive jumper settings might be incorrect (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

IEEE-1394 device not responsive

Firewire/IEEE-1394 external device does not respond to commands

Ranked causes

1. Cables of new external device loose or power cables unplugged (common)
2. Power switch on device not turned on (common)
3. IEEE-1394 port is not active; port not purchased with system (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Network controller stopped working after expansion board added

Network connectivity lost immediately after installing an expansion card

Ranked causes

1. Network controller interrupt shared with expansion board (common)
2. Expansion board is a network card conflicting with embedded card (occasional)
3. Network controller requires drivers (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Network controller stops working without apparent cause

Network connection suddenly ceases functioning with no warning or error

Ranked causes

1. Files containing network drivers are corrupted (occasional)
2. Cable not securely connected (common)
3. Network controller is defective (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power supply failure high voltage

Power LED blinks red 4 times, 4 beeps

Ranked causes

1. Power supply cable disconnected (common)
2. Faulty internal device (occasional)
3. Power supply defect (occasional)

First check

Verify four-wire power cable

Test point: Power supply cable to system board
Expected: Cable firmly connected

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Printer prints garbled information

Printed output is corrupted, illegible, or contains wrong characters

Ranked causes

1. Correct printer driver not installed (common)
2. Cables not connected properly (common)
3. Printer memory overloaded (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Workstation will not start

Workstation fails to boot or power up after new hardware installation

Ranked causes

1. Wrong memory modules used or installed in wrong location (common)
2. PCI Express power cable plugged into wrong connector (occasional)
3. Memory installed incorrectly or is bad (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Blurry video or requested resolution cannot be set

Video image appears blurry or system cannot set desired resolution

Ranked causes

1. Correct video drivers not loaded after graphics controller upgrade (occasional)
2. Monitor not capable of displaying requested resolution (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

CPU not installed

Power LED blinks red 3 times, 3 beeps

Ranked causes

1. CPU not installed in socket (common)
2. CPU not properly seated (common)

First check

Verify CPU installed

Expected: CPU present in processor socket
Tools: Visual inspection

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Diagnostics passes but workstation does not communicate with network

Network tests succeed but no actual data transmission occurs

Ranked causes

1. Network drivers not loaded or parameters do not match configuration (common)
2. Network controller not configured for this workstation (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Dim characters displayed

Text on monitor appears dim or low brightness

Ranked causes

1. Brightness and contrast controls not set properly (common)
2. Cables not properly connected (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Diskette drive not found

Diskette drive is not recognized by the system

Ranked causes

1. Cable is loose (common)
2. Removable drive is not seated properly (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Insufficient memory error during operation

Application or system reports lack of available memory while running

Ranked causes

1. Too many TSR programs installed (occasional)
2. Insufficient memory for application (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Invalid ROM checksum

Power LED blinks red 8 times, 8 beeps

Ranked causes

1. ROM firmware corruption (occasional)
2. System board defect (occasional)

First check

Reflash ROM firmware

Expected: ROM firmware successfully rewritten and verified
Tools: ROM reflash utility

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Invalid system disk message is displayed

System displays 'Invalid system disk' error message

Ranked causes

1. A diskette that does not contain the system files needed to start the workstation has been inserted in the drive (common)
2. Diskette error has occurred (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Movie will not play in DVD drive

DVD movie fails to start or play on DVD drive

Ranked causes

1. Movie regionalized for different country (occasional)
2. Decoder software not installed (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Network driver does not detect network controller

Network interface card is not recognized by the operating system

Ranked causes

1. Network controller is disabled (common)
2. Incorrect network driver (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Option ROM Error

System ROM checksum fails or Option ROM for expansion device cannot execute due to memory or corruption

Ranked causes

1. System ROM checksum failure or corrupted ROM (occasional)
2. Expansion card ROM incompatible or faulty (occasional)

First check

Flash ROM if needed

Test point: System ROM
Expected: ROM flash completes successfully

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Out of memory error

Operating system or application reports insufficient memory available

Ranked causes

1. Memory configuration not set up correctly (occasional)
2. Insufficient memory for application (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Picture breaks up, rolls, jitters, or flashes

Video display exhibits horizontal or vertical instability, flickering, or distortion

Ranked causes

1. Monitor connections incomplete or monitor incorrectly adjusted (common)
2. Monitor must be degaussed (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Poor performance is experienced

System runs slowly or sluggishly

Ranked causes

1. Processor is hot (common)
2. Hard drive is full (common)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Second Ultra ATA hard drive does not perform optimally

Secondary Ultra ATA hard drive shows degraded performance or slow access

Ranked causes

1. Using the wrong cable for the drive type (common)
2. Both slow and fast UATA devices are on the same data cable (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

System unable to boot

Power LED blinks red 9 times, 9 beeps

Ranked causes

1. System board defect (occasional)
2. Processor defect (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

System will not boot from CD-ROM or DVD drive

Computer fails to start from bootable optical media

Ranked causes

1. CD-ROM or DVD boot not enabled in Computer Setup (common)
2. Non-bootable CD in drive (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

System will not boot or does not function after installing memory

Boot failure or system malfunction following memory module installation

Ranked causes

1. Memory module incorrect type, speed, or not seated properly (common)
2. ECC and non-ECC memory mixed (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Time and Date Not Set

Invalid or missing time/date in CMOS; RTC battery may be dead or CMOS jumper improperly installed

Ranked causes

1. RTC battery depleted (common)
2. CMOS jumper not properly installed (occasional)

First check

Set date and time in Computer Setup

Test point: F10 Setup or Control Panel
Expected: Valid date and time entered and saved

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Workstation powered off automatically with red LED flashing 2 times caution

Unit shuts down unexpectedly; power LED flashes red 2 times once per second with 2-second pauses and two simultaneous beeps heard

Ranked causes

1. A fan might be blocked or not turning (common)
2. The CPU heatsink is not properly attached to the processor (common)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

A problem has occurred with a disk transaction

Disk read/write transaction has failed or encountered an error

Ranked causes

1. The directory structure is bad, or there is a problem with a file (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Audio Interrupt Conflict

Audio device IRQ address conflicts with another device

Ranked causes

1. Audio device IRQ shared with another device (occasional)

First check

Access Computer Setup IRQ assignments

Test point: F10 Setup
Expected: Audio device IRQ displayed

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

BIOS Update Needed for Processor

BIOS revision does not support installed processor; BIOS update required

Ranked causes

1. BIOS too old for processor (common)

First check

Verify current BIOS version

Test point: BIOS identification
Expected: BIOS version that supports processor

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cannot automatically launch Internet programs

Internet applications fail to start automatically

Ranked causes

1. Must log on to ISP before some programs start (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cannot connect to network server during remote system installation

System cannot reach network installation server during boot

Ranked causes

1. Network controller not configured properly (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cannot eject CD from tray-load unit caution

CD-ROM tray will not open or cannot be manually ejected

Ranked causes

1. Disc not properly seated in drive (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cannot format diskette

Diskette formatting operation fails or reports invalid media

Ranked causes

1. Invalid media reported (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

CD-ROM or DVD devices not detected or driver not loaded

Optical drive is not recognized by operating system or no driver available

Ranked causes

1. Drive not connected properly or not properly configured (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Chassis fan not detected caution

Chassis or case fan not properly connected, has malfunctioned, or is loose

Ranked causes

1. Chassis fan cable disconnected, loose, or fan malfunction (common)

First check

Inspect chassis fan cable connections

Test point: Fan power connectors on system board
Expected: All fan cables firmly seated

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Clicking noise from CRT monitor caution

Audible clicking or clacking sound from inside powered CRT monitor

Ranked causes

1. Electronic relays activated inside monitor (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Computer Cover Has Been Removed Since Last System Start Up

Chassis intrusion detection switch triggered; cover was opened since last boot

Ranked causes

1. Chassis cover removed and intrusion detection triggered (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

CPU Fan not detected caution

CPU fan not properly connected, has malfunctioned, or connection is loose

Ranked causes

1. CPU fan cable disconnected or fan malfunction (common)

First check

Inspect CPU fan cable connection

Test point: CPU fan power connector on system board
Expected: Cable firmly seated or no cable visible

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CPU or Chassis Fan not detected caution

Either CPU or chassis fan not responding; fan cable disconnected, loose, or fan has failed

Ranked causes

1. CPU or chassis fan cable disconnected or fan malfunction (common)

First check

Reseat both CPU and chassis fan cables

Test point: Fan power connectors
Expected: All fan cables firmly seated

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

More symptoms

CPU Overtemp occurred
Cursor will not move using arrow keys on keypad
DIMM Configuration Warning
Disk 0 Error
Disk 0 Failure
Disk 1 Error
Disk 1 Failure
Disk Controller Failure
Disk transaction problem
Diskette Controller Error
Diskette Drive Type Error
Display Adapter Failure
Display works during POST but goes blank on OS startup
Drive responds slowly immediately after power-up
ECC Corrected Single Bit Errors in Memory
ECC Memory Module Detected
ECC Multiple Bit Error in Memory
Extended ROM signature not found
External Storage Device Failure
Failed Processor
Fan Command 2 Pin Connector Not Connected
Flat-panel monitor display quality issues
Front Audio Not Connected
Front USB Not Connected
Game Port Address Conflict
Hard drive error occurs
High pitched noise from flat-panel monitor
Hood Lock Coil is not Connected
Inaccessible devices on primary IDE
Incompatible memory Module in memory Socket
Internet takes too long to download websites
Invalid Electronic Serial Number
Invalid Processor Jumper Setting
Keyboard Controller Error
Keyboard Error
Keyboard or System Unit Error
Master Boot Record changed
Master Boot Record lost
Memory count during POST is wrong
Memory Error
Memory Mismatch Warning
Memory Size Error
Memory Size Exceeds Maximum Supported
Memory Type Mismatch
Microcode Patch Error
MIDI Port Address Conflict Detected
Monitor does not function properly with energy saver features
Mouse moves only vertically or horizontally, or movement is jerky
Multibay incorrectly installed
MultiBay Riser Not Connected
Network Interface Card Interrupt Conflict
New network card will not boot
Noise or no sound from speakers or headphones
Out of Memory for Option ROMs
Parallel Port 2 Address Assignment Conflict
Parallel Port 3 Address Assignment Conflict
Parallel Port Address Assignment Conflict
Parallel Port Address Conflict Detected
Parity Check 2
Power Button Not Connected
Power LED flashes red 5 times and workstation beeps 5 times
Power LED flashes red 5 times; 5 beeps; memory or configuration issue
Power LED flashes red 6 times; 6 beeps; video card or system board issue
Power LED flashes red 6 times; 6 beeps; workstation beeps
Power LED is red and stays on
Power supply shuts down intermittently
Primary Diskette Port Address Assignment Conflict
Printer does not turn on
Printer is offline
Processor Not Supported
Recording audio CDs is difficult or impossible
SafePost Active - Expansion card not responding
Secondary Controller or Disk Failure
Secondary Disk Controller Failure
Serial Port 1 Address Conflict Detected
Serial Port 2 Address Conflict Detected
Serial Port Address Conflict Detected
SMART hard drive imminent failure
Sound occurs intermittently
Splash Screen image corrupted
System Audio Address Conflict Detected
System Board Failure
System does not power on and LEDs not flashing
System error indicated
System Options Not Set
System setup utility reports unprogrammed EEPROM
Temperature Alert
Typed symbols do not appear correctly
USB, audio, or IEEE-1394 device not working
Vibrating or rattling noise from CRT monitor
Wake-on-LAN feature not functioning
Windows does not detect CD-ROM or DVD-ROM drive
Workstation appears locked up and will not shut down
Workstation appears locked up while recording audio
Workstation appears to pause periodically
Workstation date and time display is incorrect
Workstation powered off with red LED flashing once every 2 seconds
Workstation seems to be locked up

98 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`101`	Option ROM Error	System ROM checksum failure or Option ROM corruption during POST	error
`102`	System Board Failure	DMA, timer, or other system board circuit test failure during POST	critical
`103`	System Board Failure	DMA, timer, or other system board circuit failure	critical
`110`	Out of Memory for Option ROMs	Option ROM memory allocation failure during POST	error
`1151`	Serial Port 1 Address Conflict Detected	Internal and external serial ports assigned to COM1	error
`1152`	Serial Port 2 Address Conflict Detected	Internal and external serial ports assigned to COM2	error
`1155`	Serial Port Address Conflict Detected	Internal and external serial ports assigned to same IRQ	error
`1201`	System Audio Address Conflict Detected	Audio device IRQ conflicts with another device	warning
`1202`	MIDI Port Address Conflict Detected	MIDI device IRQ conflicts with another device	warning
`1203`	Game Port Address Conflict Detected	Device IRQ address conflicts with another device during POST	warning
`150`	SafePost Active	PCI expansion card fails to respond during SafePost test	warning
`162`	System Options Not Set	Configuration incorrect or RTC battery depleted	warning
`163`	Time and Date Not Set	Invalid time/date in CMOS; RTC battery failure or CMOS jumper loose	warning
`164`	Memory Size Error	Memory configuration in CMOS does not match installed memory	error
`1720`	SMART Hard Drive Detect Imminent Failure	Hard drive SMART status indicates failure prediction	error
`1780`	Disk 0 Failure	Primary hard drive not detected or not responding during POST	error
`1781`	Disk 1 Failure	Secondary hard drive not detected or not responding during POST	error
`1782`	Disk Controller Failure	Primary IDE controller not responding during POST	critical
`1785`	Multibay incorrectly installed	MultiBay IDE device detected on wrong IDE controller during POST	error
`1790`	Disk 0 Error	Primary disk error detected during POST	error
`1791`	Disk 1 Error	Secondary disk error detected during POST	error
`1792`	Secondary Disk Controller Failure	Secondary IDE controller not responding during POST	critical
`1793`	Secondary Controller or Disk Failure	Secondary IDE channel error detected during POST	critical
`1794`	Inaccessible devices attached to primary IDE controller	Primary IDE devices inaccessible when SATA set to Replace Primary IDE Controller	error
`1800`	Temperature Alert	Internal temperature exceeds specification	warning
`1801`	Microcode Patch Error	Installed processor not supported by current BIOS during POST	error
`1802`	Processor Not Supported	Installed processor not compatible with system board	error
`1803`	BIOS Update Needed for Processor	Current BIOS revision does not support installed processor	error
`183`	Invalid Processor Jumper Setting	Processor speed or bus speed jumpers do not match installed processor	error
`1998`	Master Boot Record has been changed	Current MBR does not match previously saved copy	warning
`201`	Memory Error	RAM failure detected during POST memory test	error
`202`	Memory Type Mismatch	Installed memory modules do not match each other	error
`207`	ECC Corrected Single Bit Errors in Memory Socket	Single-bit ECC error detected and corrected by memory controller	warning
`212`	Failed Processor	Processor fails to initialize during POST	critical
`213`	Incompatible memory Module in memory Socket	Memory module lacks critical SPD data or is chipset incompatible	error
`214`	DIMM Configuration Warning	Memory DIMMs not paired correctly for dual-channel configuration	warning
`215`	Memory Mismatch Warning	Mismatched DIMM pairs between channels A and B	warning
`216`	Memory Size Exceeds Maximum Supported	Total installed memory exceeds system maximum capacity	warning
`219`	ECC Memory Module Detected	ECC memory installed on non-ECC platform	warning
`2 red blinks, 2 beeps`	Thermal shutdown has occurred	Processor temperature exceeds safe operating limit	unknown
`301`	Keyboard Error	Keyboard not responding or not properly connected	error
`303`	Keyboard Controller Error	I/O board keyboard controller not responding	error
`304`	Keyboard or System Unit Error	Keyboard not responding during POST	error
`3 red blinks, 3 beeps`	CPU not installed	Processor socket empty or CPU not properly seated	critical
`401`	Parallel Port 1 Address Assignment Conflict	Parallel port 1 IRQ conflicts with another device	warning
`402`	Parallel Port 2 Address Assignment Conflict	Parallel port 2 IRQ conflicts with another device	warning
`403`	Parallel Port 3 Address Assignment Conflict	Parallel port 3 IRQ conflicts with another device	warning
`404`	Parallel Port Address Conflict Detected	Internal and external parallel ports assigned to same address	error
`410`	Audio Interrupt Conflict	Audio device IRQ conflicts with another device	warning
`411`	Network Interface Card Interrupt Conflict	Network card IRQ conflicts with another device	warning
`4 red blinks, 4 beeps`	Power supply failure	Power supply unable to deliver required current or voltage	critical
`501`	Display Adapter Failure	Graphics display controller not responding	error
`510`	Splash Screen image corrupted	Splash screen image has corruption or errors in ROM	info
`511`	CPU Fan not detected	CPU fan not connected or not responding	warning
`512`	Chassis fan not detected	Chassis, rear, or front fan not connected or not responding	warning
`514`	CPU or Chassis Fan not detected	CPU or chassis fan not responding during POST	warning
`5 red blinks, 5 beeps`	Pre-video memory error	Memory test failure before video initialization	critical
`601`	Diskette Controller Error	Diskette controller or drive circuit test failure	error
`605`	Diskette Drive Type Error	Mismatch between configured drive type and installed hardware	warning
`610`	External Storage Device Failure	External tape drive not connected or not responding	warning
`611`	Primary Diskette Port Address Assignment Conflict	Diskette port address conflict with expansion card	warning
`6 red blinks, 6 beeps`	Pre-video graphic card error	Graphics hardware test failure before video output	critical
`7 red blinks, 7 beeps`	System board failure	System ROM detects system board hardware failure	critical
`8 red blinks, 8 beeps`	Invalid ROM checksum	ROM firmware checksum verification fails	critical
`912`	Computer Cover Has Been Removed Since Last System Start Up	Chassis intrusion detection triggered; cover opened since last boot	info
`914`	Hood Lock Coil is not Connected	Hood lock mechanism cable not connected or disconnected	warning
`916`	Power Button Not Connected	Power button cable not connected to system board	warning
`917`	Front Audio Not Connected	Front panel audio cable not connected to system board	info
`918`	Front USB Not Connected	Front panel USB cable not connected to system board	info
`919`	MultiBay Riser Not Connected	MultiBay riser cable not connected to system board	info
`920`	Fan Command 2 Pin Connector from Power Supply Not Connected	2-pin fan power connector from PSU not connected to system board	warning
`940`	Extended ROM signature not found	ROM flash signature missing or corrupted; firmware incomplete	critical
`960`	CPU Overtemp occurred	CPU temperature exceeded 95°F or thermal sensing failure	error
`9 red blinks, 9 beeps`	System unable to boot	System initialization fails after power-on	critical
`ECC Multiple Bit Error Detected in Memory Module`	Multiple bit error detected in memory	Chipset detects more than one bit error in 64-bit memory word	critical
`Invalid Electronic Serial Number`	Electronic serial number corrupted or invalid	BIOS cannot read or validate electronic serial number	warning
`LED Red solid or flashing`	System has experienced an error	An error condition has occurred in the system	error
`None (no LED/beep)`	System does not power on	No power LED indication; system fails to start	critical
`Parity Check 2`	Parity RAM failure	Parity error detected in memory during POST	critical

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.