I have a dual-boot setup with XP-Pro (SP2) and Fedora Linux on the same PC but separate physical drives. I recently bought a new Athlon XP 3200+ and an all-copper heatsink to go with it. The computer runs rock solid under Linux, but after a couple of hours under Windows, the computer will suddenly "shut down" (instantly exits and goes black) as if it is detecting a cpu overheat (it isn't. Only 49'C, well below max spec). If I down-clock the cpu, Windows runs rock solid too. Is there a setting in Windows that monitors cpu temp (no such tray apps running)? If it were the motherboard/bios, Linux would be crashing too. The drives check out fine (Western Digital, verified with their diagnotic software as ok). And since everything runs solid at lower speeds under Windows, that also suggests it is not the drives. This is too weird. Anyone else hear of anything like this?