2002 G3 600 mhz iMac display stays dim with an unidentified sign displayed. The contrast control does not work.

My display screen is dim and the contrast control does not work. There is a sign on the screen that I have been unable to identify. It is a white circle outline with a half moon solid circle within it. Does anyone know what's wrong?

There is a sign on the screen that I have been unable to identify. It is a white circle outline with a half moon solid circle within it
That would be a screen contrast symbol
My display screen is dim and the contrast control does not work.
Did you reset the PRAM? http://support.apple.com/kb/ht1379 And the pram battery may need to be replaced if it is over 3 years old it is under the iMac under the ram cover and there is a little button in there to reset the pmu as well. you have to have it pluged in when you do a pmu reset. there is a lot more stuff to try before the worst case scenario that is a bad PAV board the Pav is what runs the monitor and if it is going bad That may be a syptom that it is haveing and they can not be fixed (Well not for under $250 and that is useing old parts because they do not make them any more) but that wood be worst case scenario. Lets just hope it just needs to be reset Try that and Keep us posted

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Attachments:
scrolling.vi ‏818 KB

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2002 G3 600 mhz iMac display stays dim with an unidentified sign displayed. The contrast control does not work.

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