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This usually indicates an overheating or damaged video card.

With the computer turned off & unplugged, open it up, find your video card (it will be the one with the jack you plug the monitor into, assuming you don't have on-board video) and blow out any dust or debris clogging up the heatsink & fan. Also check to make sure the fan can turn freely, if theres any friction in it, the fan has gone bad and needs replacing.

If the heatsink & fan are fine, & it still does this you've probably got a bad video card. You will have to replace it.

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