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computer shuts off when trying to play video

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just yesterday any video turns off windows. goes black and the restarts news clips , movies, youtube turn it off. worked fine 2days ago.

just yesterday any video turns off windows. goes black and the restarts news clips , movies, youtube turn it off. worked fine 2days ago.

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Is it just in browser? Flash or any video? Tried Youtebe in HTML5/WebM? Wonky hardware acceleration settings? Faulty GPU hardware? Insufficient power from the PSU? Could be any of those, can you test a video in a stand alone player like VLC or Mplayer? Can you test with full acceleration on and off?

Just trying to narrow things down a bit. https://www.youtube.com/html5 you can find them easier using http://mycroft.mozdev.org/search-engines.html?name=Youtube+WebM