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Model A1103 / 1.25, 1.33, 1.42, or 1.5 GHz G4 processor

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Why is my Mac Mini turning off automatically?

For some reason, my Mac Mini G4 (1.42) keeps turning off automatically. I've tried to use different power supplies (85w and 110w), applying new thermal paste, booting into a 10.5 install disk, and none of that worked. It would turn on very briefly (30 seconds to a minute or so), then turn off. If it matters, the hard drive was dead inside the computer. However, I've tried turning on the computer w/o a hard drive and still got the same result. Please help and thank you for your time.

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Soluzione Prescelta

One of the problems with these older systems is failing capacitors.

Between the electrolytic capacitor plague and Tantalum capacitor failure from age (shorted). You will need to check the logic board carefully inspecting and testing each one in the power rail logic.

Sadly, we don’t have schematics or board views to reference on any mini. So his makes the task even harder.

That only leaves swapping out the logic board with a good one.

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Thanks for the response, I'll look into replacing the logic board or the caps.


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ducc sarà eternamente grato.
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