my PC crushes after about 30 minuts of game play with CSS or HL2, normal temp on it is 48-50 degreeds, i use Artic cooling Silencer 5, and i have a 400W PSU, my guess is my PSU, but am not sure if PSUs cause problems like that, i get a full screen of Sparks like a too high Overclocking when it crushes, last time it happend i was playing HL2, suddenly the half of the Graphics start to be come weird shapes :? could it be my PSU?