My computer (Asus A7V8x-x, XP2400, 512 DDR, GeForce FX5200, Maxtor 60Gb ATA 100 7200) was rebooting when i try to run some heavy app's (like games and so on: HL, CS, MOHAA, Q3, NFSHP2, etc). I was thinking that could be the graphics card with a hw problem... On the last night i solved the problem: how? BIOS update... Now everthing's amazing... Maybe that's your problem too... Oh, and my problem only occurs in WinXP... Linux free.... Regards Artur José Ferro Sampaio