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The BIOS uses audible beep codes or visible blink patterns to signal status messages and error messages indicating recoverable errors that occur during the POST.
Audible beep codes
These beep codes are heard through the onboard piezoelectric speaker. For boards without the onboard speaker, the beeps are heard through a speaker attached to the line out audio jack on the board.
On-off (1.0 second each) two times, then 2.5-second pause (off).
The pattern repeats once.
Then the computer continues to boot.
On-off (1.0 second each) three times, then 2.5-second pause (off).
The pattern repeats until the computer is powered off.
Three 0.5-second beeps.
Alternate high and low beeps (1.0 second each) for 8 beeps.
Then the computer shuts down.
Rising tones: 0.5 seconds on followed by 0.25 seconds off, then repeats with next tone.
After the highest tone has played, the sequence repeats with falling tones.
Visible LED blink patterns
Visible blink patterns are displayed via the front panel power LED.
Off when the update starts, then on for 0.5 seconds, then off for 0.5 seconds.
The pattern repeats until the BIOS update is complete.
Beep codes for discontinued (legacy) desktop boards
This applies to: