game freezes after seconds of gameplay?

LostnZoo

New member
well everytime i load up a game like garrys mod or cs:s i get to play for like a few seconds then the screen either turns white or black and i have to unplug my computer to restart it or i have to open up task manager to end the game. the gfx card is new too. its a nvida geforce 8600gts 256mb gddr3. i know it has enough power cuz i have a 650w psu and its connected via pci power cable.
 
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