Beep beep

I put together a p4 system with 512 memory with 2.0A Ghz processor. For whatever reason the system starts to beep once every 20-30 min. The processor runs at 39 degrees and I never get any error messages. I’ve flashed the bios and updated all drivers. I’ve had to unplug the system speaker for some peace and quiet..

The specs:

P4 2.0A Ghz, 512 ddr
MSI 845E Max2l-R MB
Lg 32X burner
Lg 16x dvd player
Windows XP Pro