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  1. #1


    Member Since
    Oct 29, 2009
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    Mac g5 Powerpc REboot problem
    Hi all.

    I have a reoccuring problem with a G5 I bought about 5 years ago from a now defunct dealer. This problem has occurred several times over its life and Im stumped. Basically in a nut shell the machine wont reboot. It also wont boot if I shut it down and try to start it back up at anytime within a couple of hours of shutting down. If I leave it overnight it generally does boot up after that.

    Im Positive it isnt a hard drive issue as Ive replaced the hard drive 3 times after thinking that was the cause (initially, when it would hang I could get it to boot from the OSX disc so figured it was a hard drive issue as when I ran a diagnostic it showed a problem with the drive - bad sectors or something I cant remember). After its 3rd drive and the same problem recurring, it became apparent that if I left the machine switched off for a period of time, it would boot without issue.

    Does anyone have any clue what this might be, or has anyone had this issue and solved the problem?

    Cheers
    Andy

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
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    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    G'day and welcome to the forums.

    Assuming your G5 is not a liquid cooled model as leaking coolant also causes this problem, your post does not say and that helps enormously to provide all information, sounds like you have a dodgy power supply which was a failing on early G5;s such as the 1.6, 1.8, 2 and 2GHz DP's.
    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!

  3. #3


    Member Since
    Oct 29, 2009
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    Quote Originally Posted by harryb2448 View Post
    G'day and welcome to the forums.

    Assuming your G5 is not a liquid cooled model as leaking coolant also causes this problem, your post does not say and that helps enormously to provide all information, sounds like you have a dodgy power supply which was a failing on early G5;s such as the 1.6, 1.8, 2 and 2GHz DP's.
    If it is, Its the noisiest liquid cooling system known to man!

    Hi Harry and thanks for the reply. I get where you're coming from with the power supply, but its been doing this for maybe 4 years. I would have thought it would have packed up all together by now and like a beacon directed me to the root cause!

    Tis a G5 Powerpc Dual 2.7 running OSX 10.5.8 (not that the OS would make a difference presumably)

  4. #4

    harryb2448's Avatar
    Member Since
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    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    Well the 2.7 is liquid cooled and when they leak that corrosive fluid gets into everything, including the logic board. Do a Google on this. Here is a start:-

    http://lowendmac.com/ppc/power-macintosh-g5.html

    Member baggss had this problem from memory with his liquid cooled G5 so when you see his avatar shoot him a PM.
    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!

  5. #5


    Member Since
    Oct 29, 2009
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    3
    Quote Originally Posted by harryb2448 View Post
    Well the 2.7 is liquid cooled and when they leak that corrosive fluid gets into everything, including the logic board. Do a Google on this. Here is a start:-

    Power Mac G5 Index

    Member baggss had this problem from memory with his liquid cooled G5 so when you see his avatar shoot him a PM.
    Well, on Googling it would appear the most obvious explaination. The Symptoms certainly tie up. Im absolutley gobsmacked to find its liquid cooled judging by the racket the fans make, but there you go, a symptom. Thanks alot for your Help Harry, much appreciated.

    I have no Idea what to do now however, this sounds expensive!

  6. #6

    pigoo3's Avatar
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    May 20, 2008
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    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by dxps View Post
    Well, on Googling it would appear the most obvious explaination. The Symptoms certainly tie up. Im absolutley gobsmacked to find its liquid cooled judging by the racket the fans make, but there you go, a symptom. Thanks alot for your Help Harry, much appreciated.

    I have no Idea what to do now however, this sounds expensive!
    Yupp...the Powermac G5 dual 2.7 definitely has a liquid cooling system. You may find these links an interesting read:

    PowerMac G5 Coolant Leaks/Repairs

    PowerMac G5 Coolant Leak Repair/Overhaul (w/photos)

    ...if you notice, both articles mention the Powermac G5 dual 2.7ghz.

    I'm not sure if you've ever opened up your Powermac G5...but there is some pretty serious plumbing on the inside for the liquid cooling system...which is pretty hard to miss.

    Good luck,

    - 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

  7. #7

    harryb2448's Avatar
    Member Since
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    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    Sorry but yes it will be very expensive and not worth the cost alas! Rather than repairs suggest you start considering putting the money towards an Intel machine.
    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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