Skip navigation

iMac - Fan doesn't stop after shutdown. Help?

2000 Views 16 Replies Latest reply: Nov 21, 2013 2:07 AM by danielemion RSS
1 2 Previous Next
T. Lange Calculating status...
Currently Being Moderated
Apr 1, 2012 6:38 AM

My iMac doesn't turn off in the normal way any more. The system shuts down and the screen becomes black, but the fan keeps on running. And it deosn't stop! The only way to completely shut down everything is to hold the powerbutton. I don't think that that's a proper solution.

 

I already have reinstalled Lion, but the problem is still prensent.

 

I've got this iMac for around 6 months now, but this problem occured around 2 weeks ago. Before everything has been all right.

 

I don't know what to do. Please help.

 

Thomas

iMac, Mac OS X (10.7.3)
  • Barry Hemphill Level 7 Level 7 (33,085 points)
    Currently Being Moderated
    Apr 1, 2012 6:48 AM (in response to T. Lange)

    Hello:

     

    Try resetting the SMC.

     

    Barry

    iMac, Mac OS X (10.7.3), 4 GB memory,DSL, Airport Express
  • Barry Hemphill Level 7 Level 7 (33,085 points)
    Currently Being Moderated
    Apr 3, 2012 3:52 AM (in response to T. Lange)

    There is one more reset that I should have mentioned...

     

    Try resetting the PRAM.

     

    Barry

    iMac, Mac OS X (10.7.3), 4 GB memory,DSL, Airport Express
  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Apr 3, 2012 5:24 AM (in response to T. Lange)

    I'd try running the Hardware Test

     

    http://support.apple.com/kb/ht1509

  • Barry Hemphill Level 7 Level 7 (33,085 points)
    Currently Being Moderated
    Apr 3, 2012 5:50 AM (in response to T. Lange)

    Do you think that an antivirus program might help?

    Absolutely not!  There are no documented viruses that affect a Mac running OS X - none.

     

    What I would do next would be to look at the log files (utilities>console) to see what is going on.  Then I would look at the activity monitor (when the fan is running after you try to put it to sleep) and see what processes are active. (utilities>activity monitor).

     

    I would also run repair disk from your software install DVD.

     

    Barry

    iMac, Mac OS X (10.7.3), 4 GB memory,DSL, Airport Express
  • Frank Cioffi1 Calculating status...
    Currently Being Moderated
    Jul 13, 2012 7:51 PM (in response to T. Lange)

    Hi Thomas,

     

    Did you ever figure this out? I have the same problem with my 2008 iMac.

     

    Thanks,

     

    Frank

  • pmorandi Calculating status...
    Currently Being Moderated
    Mar 4, 2013 11:33 AM (in response to T. Lange)

    I'm having the same problem with my 21'' imac (new in Dec 2012). After shutting down the fan comes on loudly. I need to unplug to get the fan to turn off.  When I plug back in (before turning the machine on) the fan comes on again.  After sleeping for a while the fan also turns on loudly.  I talked to Apple Care for several weeks, and finally got a new machine.  The new one is doing exactly the same thing.

  • TMacTeague Calculating status...
    Currently Being Moderated
    Mar 11, 2013 3:38 PM (in response to pmorandi)

    pmorandi: did you ever make any progress or headway on fixing the fan issue?  I have had a frustratingly simialr experience.  Purchased a new 27" iMac in early January.  The computer did what you have discribed.  Aftert taking it to the Apple Store, they eventually replaced it.  Now I have a second iMac that is doing exactly the same thing. Seems so odd that people are having multiple instances of the same thing, yet I've found very little mention of this issue on the boards.  Any new news or findings you can share?  Many thanks.

  • pmorandi Level 1 Level 1 (0 points)
    Currently Being Moderated
    Mar 11, 2013 4:23 PM (in response to TMacTeague)

    No I haven't resolved the problem. The head of my university's Apple store is looking into it, but nothing to report yet.  Since I've had two new imacs with the same problem I'm thinking this is a systematic problem.  I am also curious that I've seen so little reports on the web about this problem.

  • aellul Calculating status...
    Currently Being Moderated
    Mar 12, 2013 12:56 AM (in response to pmorandi)

    hi all

     

    i have solved this quite some time ago.

     

    in my case it resulted in a sensor not properly fitted in on the logic board.

     

    i suggest taking your mac to a specialist and tell himto check the sensors on the logic board.

     

    regards

     

    aldo

  • simonna Calculating status...
    Currently Being Moderated
    Jul 7, 2013 1:28 AM (in response to T. Lange)

    Did anyone have any luck, I have taken my IMAC into the store twice now.  First time to have the fans replaced and the second time the mother board according to the technician, the only thing left is to replace the computer. Today its just started again !!! Sigh and our first Apple, its not a nice experience.

  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Jul 7, 2013 2:49 AM (in response to simonna)

    Apple's policy is usually to replace at the third ocurrance.

1 2 Previous Next

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.