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Thread: Power Mac issue

  1. #1

    techgeek's Avatar
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    Jul 30, 2009
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    Power Mac issue
    I have a dual mirror door power mac g4 that I got for free that I am looking to repair. When I press the power button on the computer the fan start but almost immediately stop. nothing happens on the screen. additionally a red light on the inside flashes when the fans are spinning. I swapped the battery on the logic board with a new one the only difference is the fans spun a little longer than before but still did not boot. Any help would be much appreciated.

  2. #2

    baggss's Avatar
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    3.4 Ghz i7 27 in iMac (2012), 3.4 Ghz i7 MacBook Pro (2015), iPad Pro (2014), iPhone 6+
    Have you checked that the RAM is:

    -Seated properly?

    -Even present?

    -Any good?


  3. #3

    techgeek's Avatar
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    yes to all 3 I removed the ram then put just one in then switched them to test to see if it was just bad RAM( It has 2 RAM ) but it made no difference.

  4. #4

    baggss's Avatar
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    Oct 10, 2004
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    Specs:
    3.4 Ghz i7 27 in iMac (2012), 3.4 Ghz i7 MacBook Pro (2015), iPad Pro (2014), iPhone 6+
    Could be bad RAM.

    The red light means something, I'd Google that symptom along with the machine model and see what comes up.


  5. #5

    techgeek's Avatar
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    The red light just means that it is on however the light is on less than a second so I would safely assume that the computer is not running after the light is off.

  6. #6

    harryb2448's Avatar
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    Nov 28, 2007
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    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Sounds like a bad Power Supply Unit (PSU). Have a look at this thread and check out the options for examination and replacement.


    Bad Power Supply? MDD G4 trips APC overload circuit... - MacRumors Forums
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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