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A BIOS Error Messages
BIOS Front-panel Power LED Codes
The front-panel power LED blinks off and on to display messages. For example, the
power LED is on when the system is powered on, and blinks off for 0.5 second when
processor initialization is complete. In addition, whenever a recoverable error occurs
during POST, the BIOS causes the front-panel power LED to blink an error message
describing the problem (see Table 9).
Table 9.
Front-panel Power LED Blink Codes
Type Pattern
Processor initialization complete On when system powers up, then off for 0.5 second
POST complete On when system powers up, then off for 0.5 second
BIOS update in progress Off when update begins, then on for 0.5 second, then off
for 0.5 second; pattern repeats until BIOS update is
complete.
Video error On-off (0.5 second each) two times, then 3.0 second pause
(off) between on-off blink pattern; repeat entire pattern
(two on-off blinks and pause) until system is powered off
Memory error On-off (0.5 second each) three times, then 3.0 second
pause (off) between on-off blink pattern; repeat entire
pattern (three on-off blinks and 3-second pause) until
system is powered off
Thermal warning On-off (0.5 second each) four times, then 3.0 second
pause (off) between on-off blink pattern; repeat entire
pattern (four on-off blinks and 3-second pause) until 16
th
on blink, then end
BIOS Error Messages
Table 10 lists the BIOS error messages along with a brief description of each.
Table 10. BIOS Error Messages
Error Message Explanation
CMOS Battery Low The battery may be losing power.
CMOS Checksum Bad The CMOS checksum is incorrect. The CMOS memory
may have been corrupted. Run Setup to reset values.
Memory Size Decreased Memory size has decreased since the last boot. If no
memory was removed, then memory may be bad.
No Boot Device Available System did not find a device to boot.
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