Each time the computer boots up the computer must past the POST.
If the computer does not pass any of the tests, your computer will receive an irregular POST. An irregular POST is a beep code that is different from the standard one or two beeps. This could be either no beeps at all or a combination of different beeps indicating what is causing the computer not to past the POST.
AMI BIOS beep codes
IBM BIOS beep codes
Macintosh startup tones
1 long, 2 short - Indicates a video error has occurred and the BIOS cannot initialize the video screen to display any additional information.
Any other beep(s) - RAM problem.
Phoenix BIOS beep codes
Hope it can helps a lot!
EDIT:credit goes to the original author... for sharing purpose and refferences used only
Br,
If the computer does not pass any of the tests, your computer will receive an irregular POST. An irregular POST is a beep code that is different from the standard one or two beeps. This could be either no beeps at all or a combination of different beeps indicating what is causing the computer not to past the POST.
AMI BIOS beep codes

IBM BIOS beep codes

Macintosh startup tones

1 long, 2 short - Indicates a video error has occurred and the BIOS cannot initialize the video screen to display any additional information.
Any other beep(s) - RAM problem.
Phoenix BIOS beep codes






Hope it can helps a lot!
EDIT:credit goes to the original author... for sharing purpose and refferences used only
Br,
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