Graphics Card Problem (Shuts down but Computer keeps running)

I've been running the following config for over 2 months.
Yesterday I had a problem during the middle of the game. The Video Card unexpectedly shut down.

Today I ran COD MW2 twice, each time the Video Card shuts down. Its only the video card, since I was talking on skype and that kept going even after the screen went blank.
The problem only happens when I start a game, everything else seems fine. Temps on idle are around 30-40 and ingame haven't gone higher than 50.

Just wondering if anyone knows what this may be.

Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz
Thermaltake Black Widow W0319RU 850W ATX 12V
ATI Radeon HD 5850 XFX
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More about graphics card problem shuts computer running
  1. Did you try to switch the power button of the monitor on and off and on after it did this?
    Could be because of a power saving option and of course could be because of a driver switching it off.
    Try uninstalling the drivers completely and clean sweeping it, then reinstall and see if it makes a difference.
    Usually this happens after
    1. Corrupt file in the driver
    2. Windows auto updated a crucial file within the driver package
    3. Capacitor on the card or the monitor blew up
    4. Just some other related windows file gets corrupt.
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