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Thread: Power Mac issue

  1. #1
    Power Mac issue
    techgeek's Avatar
    Member Since
    Jul 30, 2009
    Posts
    22
    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
    Power Mac issue
    baggss's Avatar
    Member Since
    Oct 10, 2004
    Location
    Margaritaville
    Posts
    10,310
    Specs:
    27" 3.4 Ghz i7 iMac-13" C2D Macbook-OSX 10.10.2 -64Gb iPad 2-64 Gb iPhone 6+-ATV 2-14Tb of Storage
    Have you checked that the RAM is:

    -Seated properly?

    -Even present?

    -Any good?


  3. #3
    Power Mac issue
    techgeek's Avatar
    Member Since
    Jul 30, 2009
    Posts
    22
    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
    Power Mac issue
    baggss's Avatar
    Member Since
    Oct 10, 2004
    Location
    Margaritaville
    Posts
    10,310
    Specs:
    27" 3.4 Ghz i7 iMac-13" C2D Macbook-OSX 10.10.2 -64Gb iPad 2-64 Gb iPhone 6+-ATV 2-14Tb of Storage
    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
    Power Mac issue
    techgeek's Avatar
    Member Since
    Jul 30, 2009
    Posts
    22
    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
    Power Mac issue
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,009
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    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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