Question about Apple iMac G5 Desktop

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Distorted video on G5 iMac

My iMac has recently been turning itself off whilst in use but over the last day or so the screen has become unreadable. It looks like its covered with a net curtain. The programs run OK in the background but you can't see them to do any work. When restarting the Mac it makes a lound electronic howl before opening. Whereas I could get a proper screen previously it is always distorted now. It was suggested that the video card on the logic board has failed which means a repair of c.£650 which I cannot afford (or to buy a new Mac). The serial number does not apply to one of Apple's known faults unfortunately. Any ideas? Apple have not yet had a look at the machine.

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  • lawman2008 Nov 06, 2008

    I've tried both resets but nothing changed. The screen is still distorted with vertical bands of what looks like stitching -"""""""""""""""

    """""""""""""""

    """""""""""""""



    You can still see the icons or text behind but it is too distorted to read. I do not have anotherr monitor to attach unfortunately.

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I will try to give you a troubleshooting if you haven't done so.
first you could try is a PRAM reset, that might help to reset the paths of the logic board with internal components.
If that does not work try to reset SMC/PMU (power Management Unit) to see if that helps.
http://support.apple.com/kb/HT1894 (article with PMU instructions)

If that does not work and you want to know the issue, try to boot in verbose mode:
http://support.apple.com/kb/HT1492   ( this is the article in apple tech support that explains how to do so.)

When you do that,(in case you can see the log) it will tell you what the machine does while booting.
Try connecting to another screen too to see if it is the screen.

Let me know if this helped, if not I can try to give you a workaround.

Posted on Nov 05, 2008

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