PC restarts during certain games without BSOD Hi! I'm new to the forum, I very much hope someone could help me among you kind and helpful folks. I've just built a new pc, specs: Asus A8N-SLI Delux (on-board Realtek850 soundcard) (boxed) 3200 Athlon XP CPU Asus PCI-E 6600GT 256 Mybte video card Used old Kingmax DDR400Mhz RAM for it and old 400W psu. XP Professional SP2, downloaded newest drivers from the manufacturers (video, mboard, soundcard) etc, the usual. My problem is that the pc restarts during certain games. I'm going crazy. For example it had no problem with Half-Life 2, Prince of Persia: Warrior Within, POP:Sands of Time, F.E.A.R all during an approximately 6-10 hours of continous gameplay. (yes, I should get a real life, I know, thank you :stickout: ) But it restarted within an hour - half an hour during Gothic 2 , Conan and after a longer gameplay (3-4 hours) during Rome:Total War and Dungeon Siege 2.(latter is not a big loss at that...) Not at specific points in the games, but at random places and times. It shows No BSOD (I've unchecked the autorestart, still no BSOD) Says nothing useful in DrWatson (dump) either. I've checked the rams with memorycheck. No fault! Though I still suspect the memory card, I guess I should get another one if I had some money left after I spent a smaller fortune on the new mobo and vidcard. No overheating (not in Bios, not in XP - Asus monitoring softw.) No overheating for videocard either in Nvidia monitor. The psu must be working, since it had no problems with the previous machine and 400W must be enough according to several sites. I've reinstalled everything from scratch a few times. (both XP and games) Tried older video drivers too. Same problem. Sometimes when the game restarts right before this happens the sound is still playing or looping for a few seconds. I think maybe the on-board sound is the guilty one. I still have to check if it solves the problem if I disable it in Bios, :suspiciou I have no other soundcard installed. Anybody had similar problem? The pc did not generate this problem during DVD watching, burning, installing or anytime else, only during games. (I've not tested yet with other games, though) Please help me. I'm on the verge of nervous breakdown. Never had this problem with any of my previous machines. And I'm really hoping that not the motherboard or the videocard is the faulty one on hardware level, because here in this goddamned country the hardware dealers are nightmares, I don't even think they would replace any component, since I built the machine, and it would take months for them to do anything even if they did. Thank you for your kind help or suggestions or bullet-it-in-my-head :unch: in advance.