I just got Portal on sale of Black Friday and if I play it for about an hour it crashes. It can't be heat, I checked. Also all my power connectors and stuff are all seated well. I don't know if I should just play a different game to see if it BSOD's or what.. Also, it doesn't lag or anything when I play. It works great and the BAM! Blue screen. If anyone has any help... PLEASE HELP.