if the menu is colour correct, or shows white then the problem is probably with the cable. You say you are connected to the computer, if you are using a 15 pin VGA cable, the red colour runs on the outside (number 1 and 6 pins) and is usually the the one that breaks, without red the image typically looks green.
So long story short make sure you try a different cable first.
mark
December 2010
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