Aopen XCcube av Alarm on restart

[Digitizer]

Aopen XCcube av Alarm on restart
The Specs
skt 478 northwood 2.8ghz 533sb
512 mb corsair ddr
seagate 120gb hd
pioneer dvdrw
runs fine but if you restart it the alarm goes off ?
you have to turn it of then turn the psu switch off & on again then its fine.
The cpu temp is in the 40s so it's not heat ! any ideas ?

[Digitizer]

Aye that's what I thought