When ever I play games like HL2 and The Movies the computer just shuts down after about 10 minutes of play, my brother can still play Starcraft and listen to music and its fine anyone have any ideas. I thought it was the GPU so I took it out and reseated it to the the heatsink and it still did it. I don't think its the memory cause I passed the Prime95 ram test stable for 2 hours (I only ran it for 2 hours). I think its the CPU cause my dad had a similiar problem and it was the CPU overheating. I'll reseat it later to see if that fixes the problem.