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4 Error Messages and Beep Codes
4.1 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 32).
Table 31. 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.