Discussion in 'iMac' started by 4tune8chance, Jun 27, 2017.

  1. 4tune8chance macrumors member

    Dec 6, 2012
    Brisbane, Australia
    There is a problem with the fans on the iMac (2012's and on) once a HDD is replaced with a non 'Apple' HDD, i.e. the Fans turn on to high speed when power is of or in sleep mode. I may have accidentally found a fix (all the reset procedures have not worked for me).

    System Preferences, Energy Saver:

    Computer sleep slide - NEVER
    Display sleep slide - NEVER
    tic HDD to sleep
    tic wake up for network...
    tic power nap...

    Then leave the computer on without any interaction until the screen goes into a "screen saver mode" (thats sounds a bit strange that because you have selected NEVER).

    And that fixed it for me! Been running like it should ever since.

  2. EugW macrumors 601


    Jun 18, 2017
    Do your fans now have no control? If so, that is a bad idea.

    Perhaps install SMC Fan Control.

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