iMac about to take off?

Discussion in 'iMac' started by Matski, Aug 9, 2014.

  1. Matski macrumors newbie

    Joined:
    Aug 3, 2014
    #1
    I have a iMac early 2009 20" 2.66 which sounds like its going to take off. There is a loud whirling/spinning sound which is constant as soon as I turn it on, which i think is the fan, as air is constantly blowing out the back.

    Any idea's why the fan is doing this or might it be something else?
     
  2. Matski thread starter macrumors newbie

    Joined:
    Aug 3, 2014
    #3
  3. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #4
    Follow the link I provided and it will explain it to you.

    Or just look at this copy and paste job:

    In short, it will reset your fan speeds to standard, unless there is a process that hogs the CPU that much and your room being a bit too warm.
     
  4. Matski thread starter macrumors newbie

    Joined:
    Aug 3, 2014
    #5
    Thanks. I've reset the SMC, that did nothing. I then reset the PRAM and that did nothing. Room is fairly cool, so its not overheating. I also looked at the CPU and that is running normally, as I'm not running anything other than Safari.

    Still unsure why the fan is so loud and runs constantly?
     
  5. Rodster macrumors 68040

    Joined:
    May 15, 2007
    #6
    It's possible the thermal paste is doing it's job and/or the iMac has accumulated dust bunnies. I don't own an iMac just from past PC/electronics experience.
     
  6. Matski thread starter macrumors newbie

    Joined:
    Aug 3, 2014
    #7
    So, I need to spray some air through it, to clear any dust? I did notice a little dust when I installed a new HDD.
     
  7. chasemac macrumors 6502a

    chasemac

    Joined:
    Jan 30, 2005
    Location:
    In a house.
    #8
    You might try unplugging all peripherals besides keyboard, mouse and restart to see what happens. Not sure if you have anything else plugged into your iMac which may be the cause.
     
  8. ctucci macrumors regular

    Joined:
    Dec 16, 2008
    #9
    Could it be accumulated dust on the bottom and the on the fan port on the back?

    Could also be dust on the fans/heat sinks, given that it's an 09. That's a fair amount of time for fans and heat sinks to collect dust. If someone in the house smokes, that accelerates the problem.

    If you're willing, ifixit has a guide you can use to take a look internally: https://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2266+Heat+Sink+Replacement/935

    Not to replace the heat sink, just to have a look and perhaps clean debris.
     
  9. 53kyle macrumors 65816

    53kyle

    Joined:
    Mar 27, 2012
    Location:
    Sebastopol, CA
    #10
    Is it possible that when you were replacing your hard drive, that you might have accidentally unplugged/severed a wire for one of the thermal sensors? Sometimes if that happens, the fans will automatically run on highest just in case it starts getting hot and won't get detected.
     
  10. Rodster macrumors 68040

    Joined:
    May 15, 2007
    #11
    That wouldn't hurt although it might be better to first try and vacuum the visible dust from the vents before blasting it with air. If you decide to use air, make sure you do it in short burst.

    Also, I meant to say the thermal paste might not be doing it's job. Sorry for the typo. :eek:
     
  11. Matski thread starter macrumors newbie

    Joined:
    Aug 3, 2014
    #12
    No. I carefully installed the hdd. The fan was a problem before I installed the hdd, so I'm thinking dust could be the problem.
     
  12. khedden macrumors member

    Joined:
    Jun 18, 2014
    Location:
    Charleston, SC
    #13
    How much of a problem was it? The same kind of problem -- jet plane take-off levels?

    I just mention this because there's a thermal sensor for the hard drive which I believe you have to reverse on a third party HDD install. Check the iFixit guide to see what I'm talking about.

    If you already did all that when installing, then ignore me.
     
  13. Matski thread starter macrumors newbie

    Joined:
    Aug 3, 2014
    #14
    Reverse the thermal sensor? You mean don't have it flat side down?

    I just found this link. Nothing about reverse the sensor...

    https://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2266+Hard+Drive+Replacement/919
     
  14. khedden macrumors member

    Joined:
    Jun 18, 2014
    Location:
    Charleston, SC
    #15

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