I just got a GIGABYTE motherboard with an AMD dual core 4800 and a BFG Nvidia 9600 card with 512 memory. The cards minimum requirements are 400 watts and thats what I got but for some reason I will be playing a game for about 15MIN and the computer will just turn off. Anyone have any Ideasno expert in this bit I once had a similar problem, I left the cover off the PC to keep it cooler and it worked. I later added more COOLING fans, put the cover back on and never had the problem since !!

You spend hours checking configs etc but it could be as simple as that !!

good luck.hm, Im going to try that right now. I thought that i might not have enough power. thanks I will get back to yeahOverheating is pretty good possibility.
Did you check your computer temps while playing? fixed it!! turns out it was overheating and I was thinking it might because my box is really too small. thanks for all the help guys.Clean INSIDE of your computer with compressed air, and INSTALL extra fans, if necessary.