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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Mac pro fans going full bore


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proteus

 
Member Since: May 11, 2008
Location: Exeter
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Mac Specs: 1mac 24" 2.4

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My Mac Pro is making my bedroom into a freezer!!

Fans going **** for leather. Any ideas on how to stop it as it's been going for hours
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Alanbee

 
Member Since: Dec 04, 2009
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There are a number of things that cause the fans to run like you are describing. In my experience, it is frequently caused by a defective memory module. The memory risers in the Mac Pro have LED's, that if lit, point to a bad stick. I'd start looking there.

If the LED's are not lit, I'd try running the Apple Hardware Test located on your original install disk.

A
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harryb2448

 
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Member Since: Nov 28, 2007
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Mac Specs: iMac i5 2.7GHz, 16GB memory, OS 10.10.1

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Starting in Single User Mode can cause this and also check out System Preferences > Energy Saver > Options and make sure Automatic is selected as Processor Performance and not 'Highest".
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hughvane

 
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I recall reading elsewhere about faulty thermostats in some Pros - 'cept I don't think they're called thermostats, more like heat controllers or regulators or something. HTH

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