So right when I start the computer up, if I go into bios, it reads the cpu as being at 86c right away. Now this of coarse is not possible as I had it sitting off for a day, power it on, and right away it reads it like that... I believe it is this problem that is causing the computer to reboot itself (continually). I have made it to windows once, and it barely could start task manager (xp 32bit). I have reset the cmos, reset all default settings, checked that the cpu fan works, and checked that the heatsink is mounted firmly. I really am baffled, help? (fyi tis my sisters pc)