Help: iMac G4 17" power on issue

Discussion in 'PowerPC Macs' started by mtbdudex, Sep 20, 2008.

  1. mtbdudex macrumors 68000


    Aug 28, 2007
    SE Michigan
    I have a 17" G4 1Ghz iMac, we used it until 10 months ago when I got my new 24" Intel 2GHz machine.

    That new 24" iMac is now in the basement craftroom as the digital hub for pictures/video/etc, while I brought the 17" G4 1Ghz iMac out from my closet for the upstairs loft general web surfing machine.

    It worked for 2 days and upon shut down would not re-start.
    I could only hear the fan and nothing else.

    If I held the power button for 10 seconds upon trying to start up there was a chime that sounded for a few seconds.
    Once the fan is making small sound, nothing else, if I hold power button for 5-20 seconds the computer will shot down (fan turn off).

    Did some online checking, found article on PMU, so I did try and re-set PMU via the apple support article.Resetting the iMac (Flat Panel) Power Management Unit (PMU).
    Still, no re-start.

    It was running the latest 10.4.x update upon being put away for 10 months.

    Here is a pict of the bottom, the red light is on upon trying power on, my finger is on the PMU reset button.

    Is there any other diagnostic thing I can do?
    Is there a battery on this logic board that I can check/replace?
    I'm 100% ok at taking it apart and trying anything to fix it.

    Any help is appreciated, I don't have $$'s for apple tech, instead DIY.
  2. jaytrotter macrumors newbie

    Dec 22, 2008
    Same problem here!

    First I tried resetting the PRAM, then the PMU as you have done. iMac screen is completely black. I can't even see a faint hint of the apple logo.
  3. Reflow macrumors 68000


    Mar 30, 2005

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