Beep codes are used by the BIOS during the POST (Power On Self Test) to report certain initial system errors, through either the PC's internal speaker of through speakers attached to the sound card (if you have a built-in sound chip).
Depending on the type of the BIOS you have, the BIOS may play beeps in a specific pattern to indicate what the problem is.
Below is a list of the most common AMI, Award and Phoenix BIOS beep codes.
AMI BIOS
AWARD BIOS
PHOENIX BIOS
NOTE:Pay close attention to the number and/or pattern of the beeps your computer plays on startup.
