Harddrive fan spools to 5k for no reason

Discussion in 'iMac' started by gianthobbit, Jul 6, 2010.

  1. gianthobbit macrumors 6502

    Apr 20, 2010
    Periodically (maybe once a week) I walk into my computer room to hear the fan spooling at full speed. The iStat widget shows it is between 4-5k RPM. Sometimes restarts fix it (have to do multiple) or I reset the PRAM and that seems to fix it every time. It however happens again randomly...

    I talked to the local apple repair facility and they will take it in and look at it however I will be without my business computer for 3-4 days, which cant happen. Is there anything I can do to resolve this issue or is it purely defective hardware?
  2. mlts22 macrumors 6502a

    Oct 28, 2008
  3. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
    Reset the SMC above, most times that takes care of it.


    If that doesn't work you can run the Apple Hardware Test.


    Either the drive is overheating, the fan is dusty, or the sensor is starting to go.
  4. gianthobbit thread starter macrumors 6502

    Apr 20, 2010
    I have tried that as well. I think I got resetting pRam and the SMC confused, the steps on that link are the exact ones that I used. If I do a normal restart it sometimes stops the fan from spooling back up that fast, sometimes have to do it multiple times. If I reset the SMC the problem always goes away but then comes back later.

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