INFO: BIOS Beep Codes
 

The number of beeps is dependent on your computer's particular BIOS and is unfortunately not standardized across manufacturers. If you can match your beep code to your particular BIOS and version, you can accurately diagnose problems with your CPU, RAM, motherboard, video board, or drive controller.
Your system's beep codes should be in the written documentation for your motherboard, or obtainable from the manufacturer's web site.


American Megatrends:

1s (short) System RAM refresh failure
2s Memory parity error
3s Base 64-kbytes memory failure
4s System timer failure
5s CPU failure
6s Keyboard controller Gate A20 failure
7s Virtual mode exception error
8s Display memory read/write error
9s ROM BIOS checksum error
10s CMOS shutdown register read/write error
11s Cache memory error
1l (long) - 3s Memory test failure (non fatal)
1l - 8s Display test failure (non fatal)
Your system documentation or the manufacturer's web site may include recommended solutions to these error codes. For example, from American Megatrends:
For 1-, 2-, and 3-beep errors try reseating the system's memory modules. If that fails, it is possible that 1 or more memory modules are bad.
For a 6-beep error, try substituting a different keyboard, or reseating the keyboard controller chip.
For an 8-beep error, try reseating your video card or a different video card (if your system has a separate video card).
For 4-, 5-, 7-, 9-, and 10-beep errors, it is likely that you will need to have your motherboard repaired or replaced.