Mac fan really loud

Discussion in 'iMac' started by Runeshadow, Jul 28, 2011.

  1. Runeshadow macrumors newbie

    Joined:
    Jul 28, 2011
    #1
    I was using my mac, And it powered off, so I rebooted it and the fan was really loud, And so I turned off my mac for the night, and I come back and turn it on and it is still really loud, Please help, It is REALLY annoying, Thank you.
     
  2. Spike88, Jul 28, 2011
    Last edited: Jul 28, 2011

    Spike88 macrumors 6502a

    Joined:
    Jan 25, 2010
    #2
    .

    When an iMac gets "too hot" (way too hot), it does "last resort" auto-shut down process. When it over cooks its insides &/or does an emergency shut down, its SMC settings can become scrambled. Thus, its fan can be set super fast RPM - when the iMac is restarted. Scrambled SMC settings can be one of negative rebound effects of emergency shut downs - from being too hot.

    To reset SMC (and its brains), surf: http://support.apple.com/kb/ht3964

    As a suggestion, also install iSlayer iStats Nano ( http://www.islayer.com/apps/istatnano/ ) or iStats Pro (both are free widgets) and monitor your iMac's internal heat and internal fan RPMs. If you see any fan stuck on 0 RPM, then that specfic fan needs to be repaired / replaced. If you see the HD starting to go above 60C, then its insides are being over cooked. Apply "proactive" cooling measures to keep its insides cooler...

    Hope this helps....

    .
     
  3. Runeshadow thread starter macrumors newbie

    Joined:
    Jul 28, 2011
    #3
    Thanks.

    That helped ALOT. I didn't get the page you replied, I dont think it even said how to reset, but I just google searched and found it.


    For those who find this thread via google or something, to reset the smc requires 5 steps,

    [1] Shut down your mac.
    [2] Unplug the power cables.
    [3] Hold the power button for 5 seconds and release.
    [4] Re-plug the power cables.
    [5] Re-boot the mac as you would normally

    If this doesn't work, Idk how to help.
     

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