The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. between the years of 2006 and 2013.

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Power Problems No Boot

Mac Pro A1186

I have a Mac Pro that once power button is pressed fans spin for a second then machine is off again, so its like it never turned on just when the power button is pressed the fans spin. Do I need to replace the power supply???

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More than likely it is the power supply, but what are the diagnostic LEDs showing? If it is the power supply, it's an easy replacement. Here's how to do it: Mac Pro First Generation Power Supply Unit Replacement

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Thanks so much mayer, will give replacing the unit a try.

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Corderro Lightbourne will be eternally grateful.
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