ANSWERS: 4
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sounds like your video card is going out.
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You may want to consider unplugging the computer, opening it's case, and removing and replacing the video card (if it is not built into the mother board). I'd go ahead and spray some duster into the slot to remove the dust, but it is probably just a bit loose.
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get a new video cards from http://www.newegg.com they have great prices i like SVGA brand i have never had a issue with them
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It's the video card.
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