Appendix A
BIOS POST Codes
A-1 BIOS POST Messages
During the
Table A-1. BIOS POST Messages
BIOS Message
Failure Fixed Disk
Stuck key
Keyboard error
Keyboard Controller Failed
Keyboard locked - Unlock key switch
Monitor type does not match CMOS - Run SETUP
Shadow Ram Failed at offset: nnnn
System RAM Failed at offset: nnnn
Extended RAM Failed at offset: nnnn
System battery is dead - Replace and run SETUP
System CMOS checksum bad - Default configuration used
System timer error
Real time clock error
Check date and time settings
Description
Fixed disk is not working or not configured properly. Check to see if fixed disk is attached properly. Run Setup. Find out if the
Stuck key on keyboard.
Keyboard not working.
Keyboard controller failed test. May require replacing keyboard controller.
Unlock the system to proceed.
Monitor type not correctly identified in Setup
Shadow RAM failed at offset nnnn of the 64k block at which the error was detected.
System RAM failed at offset nnnn of in the 64k block at which the error was detected.
Extended memory not working or not configured properly at offset nnnn.
The CMOS clock battery indicator shows the battery is dead. Replace the battery and run Setup to reconfigure the system.
System CMOS has been corrupted or modified incorrectly, perhaps by an application program that changes data stored in CMOS. The BIOS installed Default Setup Values. If you do not want these values, enter Setup and enter your own values. If the error persists, check the system battery or contact your dealer.
The timer test failed. Requires repair of system board.
BIOS found date or time out of range and reset the