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  1. #1
    Powermac G4 - Boot Problems

    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
    Powermac G4 - Boot Problems
    hughvane's Avatar
    Member Since
    May 18, 2008
    Location
    Banks Peninsula, New Zealand
    Posts
    3,289
    Specs:
    MacMini 2.4, 8 Gb, OS 10.10 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
    Powermac G4 - Boot Problems
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,004
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    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
    Powermac G4 - Boot Problems

    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
    Powermac G4 - Boot Problems
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,004
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    It dioes happen at times MDD models will not boot with a flat PRAM battery.

  6. #6
    Powermac G4 - Boot Problems
    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,477
    Specs:
    iMac late 2007 10.11.b4, iMac 2008 10.10.5, Macbook2007 10.7.5, Mac Mini 10.7.5, iPhone 3GS Note 8!!
    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
    Powermac G4 - Boot Problems

    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
    Powermac G4 - Boot Problems
    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,477
    Specs:
    iMac late 2007 10.11.b4, iMac 2008 10.10.5, Macbook2007 10.7.5, Mac Mini 10.7.5, iPhone 3GS Note 8!!
    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
    Powermac G4 - Boot Problems
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,004
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5

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