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The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Power Light is always on and will not boot

Hello,

the Power Light of my Mac Pro is always on. I can switch on/off the Mac (when I push the Power Button, the 4 LEDs on the RAM Board light up briefly and then only 1 stays lit on-and the Fan also goes on) The same the opposite, when I push the Power Button for a short while, the one LED on the Memory Board goes off and also the Fan. But the power light always stays on no matter what I do. The only way to switch it off is to remove the Power. I have tried resetting the NVRAM, PRAM and SMC- sometimes I am successful ans able to start up, but then the next day no more.

Any suggestions would be greatly appreciated!

Thank you

Dorian

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I forgot to mention it is a 3.1 Model, I think A1186 (?)

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I think its the power supply

Part: ???

Guide: Mac Pro First Generation Power Supply Unit Replacement

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I'm doubtful it's a power supply issue. I've tried 3 different working PSUs and they didn't resolve the problem.

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Forgive me. I forgot to mention. I am running a 3,1 with dosdude 1's Mojave. The machine has now resorted to shutting down within 2 minutes after boot rendering it unusable.

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Forgive me. I forgot to mention. I am running a 3,1 with dosdude 1's Mojave. The machine has now resorted to shutting down within 2 minutes after boot rendering it unusable.

Previous shutdown cause is -2. What does that mean?

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@dwcdv - Did you try looking at the motherboard while its on with the sidepanel off,

look around for some lights near a button,

Press said button and post a picture of the lights

https://www.macspecialist.org/mac-pro-ea...

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