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A-1
Appendix A
BIOS POST Codes
A-1 BIOS POST Messages
During the Power-On Self-Test (POST), the BIOS will check for problems. If a problem is
found, the BIOS will activate an alarm or display a message. The following is a list of
such BIOS messages.
Table A-1. BIOS POST Messages
BIOS Message Description
Failure Fixed Disk
Fixed disk is not working or not configured properly. Check to
see if fixed disk is attached properly. Run Setup. Find out if the
fixed-disk type is correctly identified.
Stuck key Stuck key on keyboard.
Keyboard error Keyboard not working.
Keyboard Controller Failed
Keyboard controller failed test. May require replacing keyboard
controller.
Keyboard locked - Unlock key switch Unlock the system to proceed.
Monitor type does not match CMOS -
Run SETUP
Monitor type not correctly identified in Setup
Shadow Ram Failed at offset: nnnn
Shadow RAM failed at offset nnnn of the 64k block at which
the error was detected.
System RAM Failed at offset: nnnn
System RAM failed at offset nnnn of in the 64k block at which
the error was detected.
Extended RAM Failed at offset: nnnn
Extended memory not working or not configured properly at
offset nnnn.
System battery is dead - Replace and
run SETUP
The CMOS clock battery indicator shows the battery is dead.
Replace the battery and run Setup to reconfigure the system.
System CMOS checksum bad - Default
configuration used
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.
System timer error The timer test failed. Requires repair of system board.
Real time clock error
Real-Time Clock fails BIOS hardware test. May require board
repair.
Check date and time settings
BIOS found date or time out of range and reset the Real-Time
Clock. May require setting legal date (1991-2099).