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  1. #1

    Member Since
    May 11, 2008
    1mac 24" 2.4
    Question Mac pro fans going full bore
    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

  2. #2

    Member Since
    Dec 04, 2009
    2.4ghz Intel Imac
    Mac Pro fans
    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.


  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, OS X.13.4
    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".

  4. #4

    hughvane's Avatar
    Member Since
    May 18, 2008
    Amberley, Canterbury, New Zealand
    MacMini 4.1, OS 10.11 and 10.6; Macbook Pro 8.2, OS 10.12, MacBook 4.1, OS 10.6.8
    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
    Please post your Mac (or other) specs and MacOS version in your post, your profile or your signature. It helps us to help you better.

    I'm leaving now to go and find myself. If I should return before I get back, please ask me to wait.

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