Whenever I'm playing a graphic intensive game, like Starcraft 2 or Prototype, it ALWAYS crashes. What I don't know is when it happens. The music still plays, so it looks like my game is still playing, but my screen blacks out, it goes to sleep since it's not getting any signal. I have upgraded my drivers and Directx, but it still happens. It sounds like a heating issue, but I have no idea how to deal with those. How do I fix this?