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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.
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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.
Beep code
Sequence/pattern
Meaning
Troubleshooting steps
Single beep
One 0.5 second beep
F2 Setup / F10 Boot Menu prompt
This short beep occurs when the BIOS is ready to accept keyboard input. No action is needed.
2 beeps
On-off (1.0 second each) two times, then 2.5-second pause (off).