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  1. #1

    Member Since
    Oct 14, 2012
    G5 PowerMac Unexpected Intermittant Shutdown
    My PowerMac G5 periodically and without warning, just shuts down. It will start up again immediately. There are no consistent user inputs that cause the problem. Sometimes it happens shortly after boot up and at others, after hours of computing.

    Things I've tried: Cleaned the interior, concentrating on cooling fins; moved the CPU to insure adequate air flow; checked all cables for solid connections; reset, tested, and bypassed the UPS; gave it a swift kick.

    Set-up: PowerMac G5 2x2 running OS 10.4.

  2. #2

    Germany_chris's Avatar
    Member Since
    Oct 31, 2011
    Most likely a power supply...start looking for refurbished on ebay.
    Mac Pro 4,1 (Flashed to 5,1) W3570 3.2 Quad..48GB RAM..Gainward GTX 570 "Phantom."
    MacBook Pro 5,2..2.8Ghz C2D..8GB RAM..240GB Vertex +

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Fort Worth, Texas
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    Agree with the above. You might give the Powerbook Medic site a look for a replacement: Mac Repair - Mac Parts and Service for Apple Macbook, iPhone, iPad

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