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A BIOS Error Messages
BIOS Front-panel Power LED Blink Codes
The front-panel power LED is used by the BIOS to display messages. For example, the
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 8).
Table 8. BIOS Front-panel Power LED Blink Codes
Type
Processor initialization complete
POST complete
BIOS update in progress
Video error
Memory error
Thermal warning
BIOS Beep Codes
The BIOS beep codes are listed in Table 9. These beep codes can be heard through a
speaker attached to the board's line out jack (see Figure 2, B on page 14.
Table 9. BIOS Beep Codes
Type
Memory error
Thermal warning Four alternating beeps:
Pattern
On when system powers up, then off for 0.5 second
On when system powers up, then off for 0.5 second
Off when update begins, then on for 0.5 second, then off
for 0.5 second; pattern repeats until BIOS update is
complete
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
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
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
on blink, then end
Pattern
Three long beeps
High tone, low tone, high tone, low tone
th
Frequency
1280 Hz
High tone: 2000 Hz
Low tone: 1600 Hz
43
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