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CHAPTER 5 BIOS POST MESSAGE
When the BIOS encounters an error that requires the user to correct something, either a
beep code will sound or a message will be displayed in a box in the middle of the screen
and the message PRESS F1 TO CONTINUE, CTRL-ALT-ESC OR DEL TO ENTER
SETUP will be shown in the information box at the bottom.
5.1
POST BEEP
Currently there is only one beep code in BIOS. This code indicates that a video
error has occurred and the BIOS cannot initialize the video screen to display any
additional information. This beep code consists of a single long beep followed by
two short beeps.
5.2
ERROR MESSAGES
One or more of the following messages may be displayed if the BIOS detects an
error during the POST. This list includes message for both the ISA and the EISA
BIOS.
CMOS BATTERY HAS FAILED:
CMOS battery is no longer functional. It should be replaced.
CMOS CHECKSUM ERROR:
Checksum of CMOS is incorrect. This can indicate that CMOS has become
corrupt. This error may have been caused by a weak battery. Check the battery
and replace if necessary.
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