1 2 3 Previous Next 43 Replies Latest reply: Oct 7, 2013 8:16 PM by mckenz1e Go to original post
  • 15. Re: iMac 27-inch Late 2012 fan speed?
    crh24 Level 3 Level 3 (920 points)

    WZZZ wrote:

     

    I've done sucessive migrations, including using Setup Assistant (on the first boot of the new Mac) and never seen 99.99% of the problems I see on these forums.

     

    It is my belief that some 'problems' are caused by particular apps and if one doesn't use those apps then they don't see the problems.  I've just found it better for me to start from the beginning rather than migrate.  For those with different apps the migration path may be the better one.

  • 16. Re: iMac 27-inch Late 2012 fan speed?
    vestalmac Level 1 Level 1 (0 points)

    Called Apple support and they tried a number of things to diagnose and fix the problem. Nothing worked - including an attempt to wipe the hard drive clean. Support guy (Michael) was extremely helpful and authorized a new unit to be shipped to me. They couldn't determine if the using Migration Assistant was the culprit or not. There seems to be other hardware issues... no Apple chime at start up, HD won't unmount. Bottom line... they are shipping me a new iMac at no cost.

  • 17. Re: iMac 27-inch Late 2012 fan speed?
    simon0000 Level 1 Level 1 (0 points)

    So, reply from apple support: After serveral smc and pram resets no solution. it seems, that this fan noise is normal for this model. bad. in the next days i will ask someone at the local apple store.

  • 18. Re: iMac 27-inch Late 2012 fan speed?
    vestalmac Level 1 Level 1 (0 points)

    simon0000

    Re: iMac 27-inch Late 2012 fan speed?

    Dec 21, 2012 6:08 AM (in response to vestalmac)

    So, reply from apple support: After serveral smc and pram resets no solution. it seems, that this fan noise is normal for this model. bad. in the next days i will ask someone at the local apple store.

     

    Wrong - Apple support was not ok with the fan noise and did not consider this normal for the new iMac. In my case, there were additional hardware problems (hard drive) that could have been causing the fan noise... the support guys was just not able to diagnose without having the machine in front of him to work on. Because they could not resolve the fan problem over the phone, they are sending me a brand new iMac. This action certainly indicates that Apple does not consider the fan noise "normal."

  • 19. Re: iMac 27-inch Late 2012 fan speed?
    KyleTElliott Level 1 Level 1 (0 points)

    Using DesktopMonitor from the app store pegs my fan speed at 1200rpm with CPU usage at 100% idle.  Did the resets and gave things a few days for spotlight indexing.  Fan does not ever stop.  Not real loud but annoying now that I know it is there. 

  • 20. Re: iMac 27-inch Late 2012 fan speed?
    vestalmac Level 1 Level 1 (0 points)

    Update - I was able to use Internet Recovery to erase the iMac HD and reinstall OSX Mountain Lion. After reinstalling the fan speed is back down to normal. The fan is running at 1200 rpm but is barely audible. I'm not sure if this is normal or not but much better than the 2700 rpm it was running prior to the reinstall. The high fan speed seems to be the result of using Migration Assistant to transfer data from a 2009 Mac mini. The mini had been upgraded to Mountain Lion and I tried multiple times to erase the HD and restore from the mini Time Machine backup. The Time Machine restore always resulted in the high fan speed (2700). After a complete wipe of the hard drive and performing a clean install the fan seems to running normally.

  • 21. Re: iMac 27-inch Late 2012 fan speed?
    dumrese Level 1 Level 1 (10 points)

    So is mine!

    I called Apple Support and they confirmed, that at a temp of about 40 degr. Centigrade and no CPU usage the fan should not be running at all.

    As today is a public holiday in Germany, they could not tell me, if they replace my Mac with a new one.

     

    I will not put up with the "noise" of the fan after having paid a truckload of money for the 768GB Flash. It should be as quiet as my (also flash) MacBook Air.

  • 22. Re: iMac 27-inch Late 2012 fan speed?
    WZZZ Level 6 Level 6 (12,225 points)

    There is no such thing as no CPU usage. CPU is used all the time. If there was no CPU usage, your computer would be dead. And the fan should always be running, but not at high rpms; instead at its lowest default speed, which should not usually be audible. If the fan were not running, things would quickly overheat. If you are correctly stating what Apple told you, then they don't know what they're talking about.

  • 23. Re: iMac 27-inch Late 2012 fan speed?
    dumrese Level 1 Level 1 (10 points)

    ok, what I mean is what the app DesktopMonitor says: "CPU Usage: Idle 100%" by what I just wanted to say, that the Mac is not working too hard ... apart from working on not being dead i.e.

    And yes, I am correctly stating what Apple told me.

    What should the lowest default speed be?

    The fan is definitely audible.

    Ok ... here is what DesktopMonitor says on my MBAir: Fan Speed Exhaust 1996rpm ... only if I hold it directly against my ear is when I can hear that the fan is indeed running.

    Is the fan of the iMac too loud?

    Thanks for your reply!

  • 24. Re: iMac 27-inch Late 2012 fan speed?
    WZZZ Level 6 Level 6 (12,225 points)

    Don't know what the lowest default fan speed should be, but according to several posts earlier in this thread, seems like it might be 1200 rpm.

     

    You could try installing smcFan Control. That won't allow you to go lower than the default, only higher, but it should be clear from that what the defaut is.

     

    Don't know if it's compatible with your model, but you could give it a try.

     

    http://www.eidac.de/

     

    In additon, you could get a readout of the fan speed from iStat Pro widget. No longer being supported, so not all its features will work. But I think the fan speed will show.

     

    http://www.macupdate.com/app/mac/20364/istat-pro

     

    Btw, I don't think that CPU at 100% idle is possible. Some CPU is always being used. Where are you seeing that?

  • 25. Re: iMac 27-inch Late 2012 fan speed?
    dumrese Level 1 Level 1 (10 points)

    Thanks again. 1

    200 seems to be the lowest default. I already have iStat. It shows the same rpms.

    I have just talked to a friend with a brand-new 21" iMac with FusionDrive. She hears absolutely nothing, and her iStat reveals 1400 rpms, just like the 1900 non-audible rpms of the fan in my MBAir.

     

    Conclusion: there is a cheap (?), damaged (?) fan at dafault work in my new iMac. The more I am listening to it, the more annoying it gets.

    But my concern that a constantly running fan might in itself be a problem is gone. Thank you for that!

     

    I forgot: I see the 100% idle in DestopMonitor. In iStat it alternates between 99% and 100%

  • 26. Re: iMac 27-inch Late 2012 fan speed?
    WZZZ Level 6 Level 6 (12,225 points)

    I forgot: I see the 100% idle in DestopMonitor. In iStat it alternates between 99% and 100%

    I don't know about DesktopMonitor, but the kernel_task is always using some CPU. On mine, it hovers betwen 1.0 and 1.6%. Perhaps that program is just rounding off.

     

    Instead, open Activity Monitor in Utilities and go to the CPU tab>All Processes. (Activity Monitor and windowserver themselves will be using some CPU (as well as DesktopMonitor.) 100% idle is impossible.

     

    As for your fan issue, I'd bring it back in to an Apple Store and have them listen.

  • 27. Re: iMac 27-inch Late 2012 fan speed?
    simon0000 Level 1 Level 1 (0 points)

    I visited an apple retail store today, and they can't help me - because they only had one 27 inch imac in the showroom. So i've called apple support again, and my mac will be replaced in a few days.

  • 28. Re: iMac 27-inch Late 2012 fan speed?
    vestalmac Level 1 Level 1 (0 points)

    simon0000 - Did Apple support agree to replace your iMac based on the fan running at 1200 rpm even when "idle" (CPU usage at < 2%)?

     

    The iMac I received starting running at 2700 rpm (very loud) after I used Migration Assistance to migrate data from a 2009 Mac mini. Apple support tried numerous things to fix and nothing worked. They are shipping me a new iMac. In the meantime I was able to use Internet Recovery to wipe the HD and install clean Mountain Lion. Fan still ran at 1200 rpm even after a clean install (much better/quieter than 2700 rpm). I will be interested in the fan speed of the iMac straight out-of-box without any software installs (other than DesktopMonitor). Please post back your findings. 

  • 29. Re: iMac 27-inch Late 2012 fan speed?
    simon0000 Level 1 Level 1 (0 points)

    They didn't check this. But i explain them, that the fan is at 1200rpm, cpu was idle and there's no additional software installed. The guys at the support hotline and in the retail store agreed with my "under normal conditions you shoun't hear a fan noise from an apple-product"-statement.

    I tried an internet recovery too, the fan continously runs with 1200rpm, too. I will check the differences when the replacement arrives in the next year... in worst-case, the noises are normal. Hope dies last.