Hi guys, Switched my iMac white 20" at work on this morning and the screen was all messed up. Had vertical bands of different brightnesses and horizontal lines going across the screen - very faint but are noticeable. The computer has been on for about 2hrs now and the vertical banding seems to have faded for the most part but the horizontal lines are still present. Have called Apple and they have told me to take it to a repair centre, but its out of warranty and am clutching at every straw to hope its something I can fix myself. Anyone have any experience of this problem?