G$ PowerMac - shuts itself off

Discussion in 'PowerPC Macs' started by ChrisA, Apr 17, 2007.

  1. ChrisA macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    I have a G4 Power Mac. It's the "digital audio" model that has been upgraded with a 1.2Ghz G4 processor. It works well except for one thing. It shuts down randomly and suddenly. Then after 5 or 10 minutes it turns itself back on, reboots and runs fine. (It is set to re-boot after a power failure.)

    I suspect what is happing is the power supply is turnning itself off due to some kind of a thermal, self protection switch. The fan seems to work but the PS gets warm.

    What's the cure? Replace the power supply? If so where to get a new(er) one? Will generic PC supplies work.
  2. trainguy77 macrumors 68040

    Nov 13, 2003
    I would try resetting the PMU button on the motherboard. This will reset the Power management unit. There will be how to guides on apples site for your system.

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