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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Upgraded 2009 Mac Pro won’t start

i recently upgraded my 2009 4.1 with a 2010 12 core processor tray, 32GB of RAM and a Sapphire Radeon Pulse RX 580 8GB. The first card went bad but the second has been okay, so far. I have 2 monitors, an HD Apple and a Wacom Cintiq.. it’s running High Sierra.

Today, while I was browsing, the screen went white (the Cintiq screen went blue). I immediately shut it down and tried to restart in safe mode. Nothing and no sleep light. I looked up info on what to do, unplugged all peripherals, and tried unplugging the power cord, holding the power button for 10 secs, and replugging. Nothing.

I held it down again for 10 secs, unplugged the power cord, waited 10 secs, plugged it back in and it didn’t start but the red led OVTMP CPUB lit, steady. I’ve tried restarting, but it only clicks, nothing happens, then I have to hold it down to shutdown click. I unplugged again, the red light went out, plugged in again, no warning lights. When DIAG LED is pressed the 5v STBY lights up yellow.

Any ideas? I thought it might be the power supply, but I’m not sure. Would that cause a white screen if it went out? Could the video card have gone bad again? Thanks in advance for any help!

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If you put the old parts does it work?

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I was going to try swapping in the old video card (I’m at back to back Dr appts right now), but I don’t think I can’t swap out the processor tray since it’s flashed to 5.1, now. Is that correct? Could this bee another bad video card?

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I put in the old processor tray and plugged it in but it does the same, I press the power button and nothing happens, the Diag bottom makes the 5v Stdby led come on.

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JayJay Jackson 将永远感激不已
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