My PC has been freezing randomly, ctrl-alt-del won't work and the only option is to reboot.

I've already installed a fresh copy of XP, updated all drivers and bios, swapped out hard drive and ram.

I have another processor on the way so I can rule that out too but in the meantime is there a utility or boot disk I can use to test my logicboard?

It's a 939 Dual Sata 2.

Thanks very much,Baba