iMac fans running constantly

Discussion in 'iMac' started by allenmertes, Feb 28, 2011.

  1. allenmertes macrumors member

    Joined:
    Dec 1, 2005
    Location:
    South Bend, IN
    #1
    I recently installed new RAM into my older Intel iMac. Ever since, the internal fans will not stop running. I checked the activity monitor and nothing is hogging the CPU. I also tried putting the computer to sleep, shutting it down, and resetting the SMC.

    I'm not sure if it's related to the new RAM- I used the crucial online tool and know that the RAM is correct for the computer. Any other ideas? Thanks.
     
  2. TMRaven macrumors 68020

    TMRaven

    Joined:
    Nov 5, 2009
    #2
    Even after taking the new ram out and/or unplugging the computer for a minute or two?
     
  3. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #3
    Install iStat Pro to monitor your fan speed, among other things. The fans are designed to always run when your Mac is on. They just speed up as needed when temps are sustained at a higher level. For example, the minimum fan speed on the MBP is around 2000 rpm. I assume is similar for the iMac.
     
  4. MarkMS macrumors 6502a

    Joined:
    Aug 30, 2006
    #4
    It may be dust clogging the back port of the iMac that is causing the machine to heat up and consequently make the fans run at a higher speed than usual.

    I think with bad RAM, you'd be seeing a Kernel Panic aka "Black screen of death" and not a major increase in fan usage ... unless you are doing heavy duty work on the iMac.
     
  5. allenmertes thread starter macrumors member

    Joined:
    Dec 1, 2005
    Location:
    South Bend, IN
    #5
    Yeah- I tried reseating the RAM several times.

    I downloaded it, but I'm not sure what to do with the info. Internal temperatures were ranging from 30-49 degrees. Hard drive fan speed is at 5000 RPM and CPU fan is at 900 RPM.

    I don't think the RAM is bad, either. The computer is much zippier and system preferences is showing that the RAM is ok...
     
  6. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #6
    Your temps are certainly normal, but your HD fan speed is excessive. Does it do the same after you reboot?
     
  7. allenmertes thread starter macrumors member

    Joined:
    Dec 1, 2005
    Location:
    South Bend, IN
    #7
    Yep- doesn't change at all.
     
  8. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #8
  9. henrik-s macrumors newbie

    Joined:
    Nov 1, 2008
  10. TMRaven macrumors 68020

    TMRaven

    Joined:
    Nov 5, 2009
    #10
    Have you ever replaced the hard drive yourself? One last thing you can do is boot up hardware test and it will tell you if you have a faulty temp sensor on your motherboard.
     

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