Random Computer Shutdown

So I recently put a new nVidia 250GTS graphics card in my computer. It works great except that if I am playing a game for a while, the computer will occasionally shut down randomly. It just goes black. Is this a power supply issue? a cooling issue? I've no idea, but i can't imagine its good for the machine.
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  1. It would help if you provided detailed info about your system. What motherboard, PSU, motherboard, etc.?
  2. My knee jerk reaction is a heat and/or power problem. Just like you guessed.
  3. PSU is most likely. what do you have? we need other system specs too.

    and i have to ask, is the game causing the shutdown MW2? that game is more trouble than its worth...
  5. Alright, sorry this took so long. I've been out of town.

    CPU: Intel Core2 Quad 2.40GHz
    Motherboard: ASUS P5N-D
    GPU: PNY nVidia 250GTS 1024mb
    OS: Windows Vista
    HDD: 500gb Hard Drive
    Power Supply: 680 watts.

    I can get more detailed information if you would like. i just don't know exactly what you need.
  6. Oh and the game im usually playing is just World of Warcraft or Warhammer Online. Nothing too power-consuming.
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