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iMac problems

349 Views 6 Replies Latest reply: Feb 1, 2013 9:18 AM by John Galt RSS
MYKS Level 1 Level 1 (0 points)
Currently Being Moderated
Feb 1, 2013 12:58 AM

The fan on my iMac is constantly making noise while the machine is on and sometimes after shutting down my iMac, it wouldn't start again for several hours.  Does anyone know why and how do I rectify these problems.

iMac, Mac OS X (10.6.8)
  • Radiation Mac Level 5 Level 5 (4,630 points)
    Currently Being Moderated
    Feb 1, 2013 4:43 AM (in response to MYKS)

    I would download and install the excellent and Free App below to check your hardware component's temperatures inside your Mac, and you can post those temps here for comments:

     

     

                       http://istat-pro.en.softonic.com/mac

  • John Galt Level 7 Level 7 (33,100 points)
    Currently Being Moderated
    Feb 1, 2013 8:37 AM (in response to MYKS)

    Those temperatures appear to be normal, and so do the fan speeds. Was it making noise when you captured that image?

  • John Galt Level 7 Level 7 (33,100 points)
    Currently Being Moderated
    Feb 1, 2013 9:18 AM (in response to MYKS)

    A speed of 1000 RPM should barely be audible but the values reported may not be accurate, if their tachometers are inop.

     

    Run Apple Hardware Test:

     

    http://support.apple.com/kb/HT1509

     

    Report any errors it finds.

     

    You must remove the firmware password, if one has been set, before you can use AHT.

     

    The inability to start your Mac may or may not be related to this, but any problems related to unexpected system sleep, shutdown, lights or fans justify an SMC reset:

     

    Before Resetting the SMC

     

    Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.

     

    1. Press Command + Option + Escape to force quit any application that is not responding.
    2. Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
    3. Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
    4. Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.

     

    Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve

     

    1. Shut down the computer.
    2. Unplug the computer's power cord.
    3. Wait fifteen seconds.
    4. Attach the computer's power cord.
    5. Wait five seconds, then press the power button to turn on the computer.
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