How To Interpret Beep Codes

Each time you start the computer, the BIOS conducts a power-on self-test (POST). If the computer freezes or otherwise fails to boot, the CPU may be unable to communicate with one or more hardware components. The cause may be a faulty component, faulty installation or a problem with the BIOS. During the POST, a series of beeps may sound an audio code to indicate what problem has occurred. Most PCs beep once at the successful completion of the POST, some beep twice.

Caution: Please read our safety information before attempting any testing or repairs.

The meaning of the code will depend on what brand and version of BIOS is used. Furthermore, motherboard and computer manufacturers will sometimes modify the BIOS and associated codes. The table below describes the general case failure associated with the beep code for the three most popular BIOS'. Be advised that because of a lack of standardization, your beep codes may not match this table.