Screen problems??? - iMac G5 (First Gen)

Discussion in 'PowerPC Macs' started by gilmoregirlz, Mar 30, 2009.

  1. gilmoregirlz macrumors newbie

    Mar 30, 2009
    I'm looking for some information and possible repair tips for my cousins iMac G5 (First Gen) 1989. Please bare with me....I don't know anything about mac's, I've always been a PC user. But, I recently fixed both my aunt's laptop and desktop (both pc), so my cousin asked if I would take a look at her mac, as well.

    Basically, when the iMac is turned on, the screen goes weird. It fills with a BUNCH of lines (both horizontal and vertical), some spanning the entire length of the screen, and some being only about half an inch long. The lines don't stay stable, they flicker and change positions every few seconds. Behind the lines, you can see the black screen with the apple on it. It doesn't seem to get past this point though, it seems to freeze and never leave the apple screen, although the flickering lines continue to change. (My cousin said that it used to boot up further and would work fine for a few minutes, then the lines would start, so obviously the problem has gotten worse.)

    I tried jiggling and moving the power cord around, and whenever I moved it the lines on the screen seemed to change positions. I also tried taking hold of the sides of the monitor (machine? I have no idea what mac-speak for anything is) and very gently pressing and "twisting", and this changed the lines as well, at one point it turned to all vertical lines spanning the entire length of the screen. We opened it up to see if any wires were loose inside or anything, but there really weren't any exposed wires that I could see that I could even try to tighten/adjust.

    Anyone have any ideas? I could get a picture or video of what it's doing if that would help any. Right now it's not even usable.
    I'd sure appreciate anyone's thoughts on this, and my cousin would appreciate it as well! :)
  2. Tudeski macrumors member

    Jul 17, 2008
    maybe the video card? do you have a pic of it?
  3. gilmoregirlz thread starter macrumors newbie

    Mar 30, 2009
    I don't have a picture of it, I knew I should have taken one when I was there, but I just didn't. :rolleyes:
    I'll try to get a picture of it in the next couple of days and I'll post back with it.
  4. MTI macrumors 65816

    Feb 17, 2009
    Scottsdale, AZ
    Like most other laptop or compact designed computer circuit boards from that era, faulty capacitors were used on the logic board and power supplies of the early G5 iMacs. The capacitors bulge and/or leak electrolyte, which initially manifests itself in reliability problems.

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