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Appendix A Error Messages and Codes
Compaq Personal Computers
Changed - April 1998
A-2
A.4 POWER-ON SELF TEST (POST) MESSAGES
Table A–3.
Power-On Self Test (POST) Messages
Table A-3.
Power-On Self Test (POST) Messages
Error Message Probable Cause
Bad PnP Serial ID Checksum Serial ID checksum of PnP card was invalid.
Address Lines Short! Error in address decoding circuitry on system board.
Cache Memory Failure, Do Not Enable
Cache!
Defective cache memory, CPU has failed.
CMOS Battery Failed Low RTC/CMOS battery
CMOS Checksum Invalid Previous and current checksum value mismatch.
CMOS System Options Not Set Corrupt or non-existant CMOS values.
CMOS Display Type Mismatch Graphics/video type in CMOS does not match type detected by
BIOS.
CMOS Memory Size Mismatch Memory amount detected does not match value stored in CMOS.
CMOS Time and Date Not Set Time and date are invalid.
Diskette Boot Failure Boot disk in drive A: is corrupt.
DMA Bus Timeout Bus driven by device for more than 7.8 us
DMA Controller Error Error in one or both DMA controllers.
Drive Not Ready Error BIOS cannot access the diskette drive.
Diskette Drive Controller Failure BIOS cannot communicate with diskette drive controller.
Diskette Drive Controller Resource
Conflict
Diskette drive controller has requested a resource already in use.
Diskette Drive A: Failure BIOS cannot access drive A:.
Diskette Drive B: Failure BIOS cannot access drive B:
Gate A20 Failure Gate A20 of keyboard controller not working.
Invalid Boot Diskette BIOS can read but cannot boot system from drive A:.
Keyboard Controller Error Keyboard controller failure.
Keyboard is Locked…Please Unlock It Locked keyboard.
Keyboard Stuck Key Detected Key pressed down.
Master DMA Controller Error Error exists in master DMA controller.
Master Interrupt Controller Error Master interrupt controller failure.
Memory Size Decreased Amount of memory detected is less than stated value in CMOS.
NVRAM Checksum Error, NVRAM
Cleared
ESCD data was re-initialized due to NVRAM checksum error.
NVRAM Cleared By Jumper NVRAM has been cleared by removal of jumper.
NVRAM Data Invalid, NVRAM Cleared Invalid entry in ESCD.
Off Board Parity Error Addr. (HEX) = X Parity error occurred in expansion memory, x= address of error.
Parallel Port Resource Conflict Parallel port has requested a resource already in use.
PCI Error Log is Full PCI conflict error limit (15) has been reached.
PCI I/O Port Conflict Two devices requested the same resource.
PCI Memory Conflict Two devices requested the same resource.
Primary Boot Device Not Found Designated primary boot device could not be found.
Primary IDE Cntrl. Resource Conflict Primary IDE controller requested a resource already in use.
Primary Input Device Not Found Designated primary input device could not be found.
Secondary IDE Controller Resource Secondary IDE controller has requested a resource already in use.
Serial Port 1 Resource Conflict Serial port 1 requested a resource already in use.
Serial Port 2 Resource Conflict Serial port 2 requested a resource already in use.
Slave DMA Controller Error Error exists in slave DMA controller.
Slave Interrupt Controller Error Slave interrupt controller failure.
Static Device Resource Conflict A non-PnP ISA card has requested a resource already in use.
System Board Device Resource
Conflict
A non-PnP ISA card has requested a resource already in use.
System Memory Size Mismatch Amount of memory detected on system board is different from
amount indicated in CMOS.
NOTE:
PCI and PnP messages are displayed with bus, device, and function information.