PC restarting when exiting games!

Hello,
I got a problem with my pc made by myself and a friend,all the components are in place, got windows 7 ultimate on it, and it runs smoothly, but sometimes when i exit any game, the pc automatically restarts without any warning or something, it simply goes black and insta-restarts himself. Note that it restarts only sometimes when I exit games not all the time. Any information would be useful, if nothing will work then ill reinstall the windows and see how it manifests.Thanks in advance.

Configuration: Windows 7 ultimate, 2 Gb ram (dual channel), Ati Radeon HD 3870x2, 500 gb WD, 550w source(Recom), intel core 2 duo 2,93 Ghz, P45 Neo/ G45 Neo Motherboard
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More about restarting exiting games
  1. Is it just one game or many games? Some games need to be run in compatability mode when running under Windows 7 as older games were made for Windows XP.

    Can you confirm whether your motherboard is a P45 or G45? I believe the G45 is onboard graphics which may have a bearing.
  2. doive1231 said:
    Is it just one game or many games? Some games need to be run in compatability mode when running under Windows 7 as older games were made for Windows XP.

    Can you confirm whether your motherboard is a P45 or G45? I believe the G45 is onboard graphics which may have a bearing.

    When I exit any game, for example Starcraft 2, and the motherboard is P45 Neo-F.
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