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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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Mac Pro mid-2010 shuts down

Apple Mac Pro, 2.66GHz 6-core Xeon X5650 "Mid 2010" with 16GB DDR3, 1.0TB 7,200RPM HDD, 18X "SuperDrive", HD 5770/1GB

Mac Pro mid 2010s running Snow Leopard (and Lion) worked fine for years but shut down suddenly about a week ago. Since then will not stay on for more than a few minutes and sometimes will not turn on at all.

Sometimes there is a single red flash from inside the machine when power button is pressed. At those times the machine doesn't turn on at all.

What I have tried:

I started in Recovery mode and did First Aid but it didn't report any problems.

I tried pressing D while starting up (after removing all peripherals except monitor keyboard and mouse) but the Apple Hardware Test didn't come on.

Our local repair shop has a policy of not working on such an old operating system.

Any suggestions would be appreciated.

Thanks,

Michele

Answer this question I have this problem too

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Check backup battery first. Weird things can happen once they go dead.

14 years is a long time for one of these to still have any voltage.

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