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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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EXHAUST and BOOSTB fans running at 0RPM, BOOSTA running at full speed

Title says it all, here’s a screenshot from macs fan control

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Where do I even begin on trying to fix this? Exhaust had always been broken, never bothered to fix as I had no idea where to begin. I just repasted both of the CPUs and all of the sudden BOOSTB stops working and BOOSTA runs at full speed all the time.

Отвечено! Посмотреть ответ У меня та же проблема

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Fan's do fail over time ;-{


@danj any clue where the exhaust fan is so I can replace it?


@tronke - Which model do you have? Look through this list MacPro's. Apple created a few variations which different internals.

Have you tried just looking at the fans so set which ones are not spinning?


Found the fan, I used macs fan control to activate all of the fans and I isolated the one that wasn't spinning :)


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Answering this for myself, the processor was not seated correctly and therefore was causing these issues. Doh!

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tr121 будет вечно благодарен.
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