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  1. #1


    Member Since
    Jun 04, 2014
    Posts
    1
    MDD G4 power supply problem
    Hi everyone. I recently changed out a PS from my MDD Dual 1.4 GHZ model to my MDD dual booting 1.2 single GHZ model. Both PS were the same model except the 1.4 had some newer fans on it thus quieter so I swithed it out to my dual booting 1.2 model since I am getting rid of my dual 1.4 model. However, now once I hit the power button it clicks on for a sec and then shut rights off. Meanwhile, the other mac with the PS from the 1.2 powers and boots just fine. So whats up? I did add another HD to it but that shouldnt effect it right?
    Did I fry the other PS, changing it?

  2. #2

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
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    34,536
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by paulwgraber View Post
    Both PS were the same model except the 1.4 had some newer fans on it thus quieter so I swithed it out to my dual booting 1.2 model since I am getting rid of my dual 1.4 model. However, now once I hit the power button it clicks on for a sec and then shut rights off.
    Since you are having problems...I would say that the two power supply's aren't as exact as mentioned.

    The 1.4 has dual cpu's...the 1.2 has one cpu. Two cpu's need more "juice".

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  3. #3

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    34,536
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Let me mention this as well. I think that power supplies can get "weak" over time. So maybe the PS from the 1.2 is getting old/weak...and putting it into a MDD with dual cpu's could be asking too much of it.

    So the PS's could be the same...just that the MDD 1.2 PS is weak.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  4. #4

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    21,863
    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    There were two different power supplies, a 344 watt and a 400 watt. From memory, which is getting old and frail lol, the 400 will work in all models, the 344 in 1Ghz/1.25GHz singles. Sometimes the capacitors go and bulge. Have you taken the PS apart and checked these?
    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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