iMac Fans Running Constantly - How Can I Stop It?

Discussion in 'iMac' started by ucfgrad93, Dec 11, 2009.

  1. macrumors P6


    Aug 17, 2007
    Ok, so I just got my iMac back from having the logic board replaced. It booted up fine, but the fans are running constantly. They did not do this before the repair. Is there any way I can adjust this? My wonderfully silent iMac is now pretty loud.
  2. macrumors 65816


    Jan 15, 2009
  3. macrumors 6502

    Nov 10, 2009
    one of the sensors are no plugged in I suspect.

    Go and install istat nano and look at the Fan speeds and Temperature.

    if you are missing one of the temp sensors then it is either unplugged or loose.

    Should have a CPU, GPU, Optical drive, Hard drive, and ambient temp readings. if you are missing any of those then they forgot to plug something back in.
  4. macrumors 6502

    Nov 10, 2009
    btw, forgot to add, if the fan speeds are over 3000rpm it is running too high, normal speeds are around 1k.
  5. macrumors newbie

    Dec 11, 2009
    I have this problem too, which started during Migration Assistant. The noise was impressive -- louder than an Xbox 360 -- and continuous. iStat showed the HD fan spinning at 3400rpm, so it's going back to the reseller on Monday, and swapped out the same day.

    Add another problem to the imac I7s! Fortunately, everything else seems okay.

    My fan speed starts off silent (and does this if you put the machine to Sleep and then wake it up), but gradually gets louder over the course of 30 minutes.

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