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  1. #1


    Member Since
    Jan 23, 2010
    Posts
    4
    Powermac G4 - Boot Problems
    I apologize if this topic has come up a lot, but I have an issue with my Powermac g4

    The problem is that when i press the power button, the power light flashes on then goes off. The machine tries to boot up, but the screen remains black. The fans turn on, but nothing else happens. The machine stay will on and the fans running until I press and hold the power button to turn it off.

    Not sure what the problem could be or how to fix this.

    I believe I have Leopard OS on this machine, if thats a contributing factor.

    Thanks!

  2. #2

    hughvane's Avatar
    Member Since
    May 18, 2008
    Location
    Banks Peninsula, Canterbury
    Posts
    3,306
    Specs:
    MacMini 2.4, 8 Gb, OS 10.11 and 10.6; MacBook 2.4, 4 Gb, OS 10.6.8
    Firstly, welcome to the forums.

    You're right, this topic has appeared a lot, but it's not always easy to find the posts.
    Resetting your Mac's PRAM and NVRAM

    It ALWAYS helps to post the model and specs of your machine so experienced users can relate their experience in fixing the problem. There are 10 models of G4 PwrMac, which one do you have?
    ABCDEFGHIJKLMNOPQRSTUVWXYZ
    Please post your Mac (or other) specs and MacOS version in your post, your profile or your signature. It helps us to help you better.

    I'm leaving now to go and find myself. If I should return before I get back, please ask me to wait.

  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    21,886
    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    Try resetting the Power Management Unit, or CUDA as set out below:-

    Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

  4. #4


    Member Since
    Jan 23, 2010
    Posts
    4
    Thanks for the quick responses!

    I tried resetting the PMU, to no avail unfortunately.

    I am unsure exactly which model I have, since I cant turn it on. I do know its 1Ghz Dual and it has the mirrored doors.

    The video card is by ATI

  5. #5

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    21,886
    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    It dioes happen at times MDD models will not boot with a flat PRAM battery.

  6. #6

    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,900
    Specs:
    iMac 2010 27" QuadI7 OSX10.11, iMac 2008 OSX10.11, MBP Late2011OSX10.11 , iPad Air, iPhone 3GS
    Just a hunch. Do you have a voltmeter there of any kind? If so check the PRAM battery. Should measure 3.6 Volts or close. Seen many G4 system that would not boot if that battery was dead.

  7. #7


    Member Since
    Jan 23, 2010
    Posts
    4
    I dont have a way to measure the voltage in the PRAM's Battery

    Assuming it is the PRAM battery, is that an easy or cheap fix?

  8. #8

    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,900
    Specs:
    iMac 2010 27" QuadI7 OSX10.11, iMac 2008 OSX10.11, MBP Late2011OSX10.11 , iPad Air, iPhone 3GS
    Radio Shack can order them and some stores might have it in stock. You can find them cheap on Ebay. Do a search for Mac PRAM battery and see what you find.

  9. #9

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    21,886
    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.

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