G4 MDD Sleep = Shutdown??! HELP!

Discussion in 'PowerPC Macs' started by MJrocks, Dec 28, 2010.

  1. MJrocks macrumors newbie

    Dec 28, 2010
    When I select "SLEEP" from the Apple menu, press the power button my cinema monitor, the power button on the tower or the system is set up to sleep after a certain period of time - the tower immediately powers off, not even a complete shutdown cycle occurs.

    No new software has been installed (previous to issue)

    I have already completed the following:

    -Unplugged all USB devices (other than apple mouse/keyboard)
    -Reset PRAM
    -Reset PMU
    -Swapped out RAM chips (and mem tested them - no issues)
    -Repaired permissions
    -Cleared cache's
    -Repair Disk from Start-Up CD
    -Rebuilt directory from Techtool Pro

    Any thoughts? Is there a log somewhere I can view/post to assist in this issue?

    System Info:
    Dual 1.25Ghz
    2Gb RAM
  2. OrangeSVTguy macrumors 601


    Sep 16, 2007
    Northeastern Ohio
    I'm not 100% sure but I'm thinking it's the power supply. Since it shuts completely off when you put it into sleep mode. The MDD PSU's are notorious for their problems and I think I heard of faulty power supplies causing sleep issues. Do you have a volt meter? Check all the wires on the PSU.

    You best bet is to use a normal ATX power supply and mod it to work in the G4 MDD. You will loose the ability to power the Apple Cinema Displays if you use the ADC connection on the graphics card.
  3. rickwTX macrumors newbie

    Jan 26, 2011
    sleep of death

    I'v had/have the same thing, power supply. I even tried reverting to OS9. But, I have 2 MDD's and wouldn't give them up for anything. I'm looking for a dead one right now to complete my trio from a parts machine.

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