from pushardware.com:
When I try to boot my motherboard beeps at me. What does this mean?
There are a number of beep code you may experience:
No beep at all - this means your motherboard is dead, either due to a defective or underpowered power supply, poorly seated CPU or RAM, or a dead-on-arrival board
One beep - board is working fine
One long beep then machine shuts down - faulty, improperly installed or missing CPU
Beeeeeep-beep-beep - this means no video card detected (or poorly seated video card)
A single tone, repeated over and over. This is a memory problem (could be the DIMM, the controller, or the CPU cache memory).
A two-tone siren, generally caused by overheating or out of specification voltages.
Rapid stream of beeps - this means a key is stuck on your keyboard, it is not properly plugged in, or the keyboard is incompatible in some way
Four beeps then machine shuts down - with BIOS version WW or WZb00 - this is because these version of the BIOS will shut down your machine if no fan tachometer signal is detected on FAN1 header. Make sure you attach a fan to this header! BIOS WZb01 and later have this functionality disabled by default, and it can be enabled in the BIOS.
The AWARD BIOS offers no other codes - any other error messages are displayed on the screen.
good luck!
mike