Does the screen on a G4 iMac go around and around enough to wind up the lcd wiring? This would presumably cause problems - and I am having problems with a 15" unit just acquired - but disassembly of the supporting arm for investigation looks pretty complicated. Anyone have any experience of working on these things? Need I be worried about this issue?

The reason is that I have managed to get a perfect screen image once with some fiddling with wires, but normally what is displayed is a multicoloured smudge. Could be the graphics chip too, I know, but pinched wiring seems a good deal simpler to correct.