It could be a defective or dirty video card. But in the some cases, where built-in graphics is used (no video card, built-in to motherboard) it is the memory (RAM) that is causing the problem.
Try removing your video card (if you have any) or memory from the board.
Video card removal instructions:
http://bit.ly/1m0jwb3
Memory removal instructions:
http://bit.ly/1s5svYr
Clean the pins (gold contacts) with a rubber pencil eraser. Install the memory or the video card back to the board & power-on. If this doesn't work, replace the defective unit.
You may also try cleaning the internals of the computer using a non-static brush & a can of compressed air.
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