suddenly the cooling-fan is alive! is it here to stay?

Discussion in 'iMac' started by fuchsi, Oct 7, 2010.

  1. fuchsi macrumors member

    Aug 26, 2010
    I've had my Imac for almost 6 weeks now.
    I'm in the media business so i need the computer for lots of Editing & Rendering.
    Last week was the first time i really started testing the machine out, i had to finish a project for a customer.
    I started rendering out the HD material for their youtube channel.
    After 3 of those 2 minutes Videos in a row suddenly the fan started roaring very loud (for the first time since i bought it) which is normal i figure.
    I have to say it cooled down pretty fast once it was done.
    But one thing i have noticed is recently when i boot the machine and its in normal status i can hear the fan working, low noise but it's there from start suddenly
    Why is this happening? the first 5 weeks it never did that! it was totally silent when fresh booted!
    Have i woken up a sleeping dog? :D

    Would apretiatte some advice
  2. fuchsi thread starter macrumors member

    Aug 26, 2010
    Thanks that's great information.
    But i don't really know if the issue demands such radical methods, well not now at least :D

    The noise doesn't bother me, it's just that i was wondering why it's suddenly running up from start and if it's telling me somthing

  3. spinnerlys Guest


    Sep 7, 2008
    forlod bygningen
    Use iStat Pro to monitor CPU temperature and fan speed and even CPU usage.

    Btw, the method I linked to is not really drastic and takes less than a minute, though a restart is required.
  4. fuchsi thread starter macrumors member

    Aug 26, 2010
    Good widget.
    Now who wants to compare Fanspeeds so i have a guideline :)??

    Optical drive 998 rpm
    Hard Drive 1097 rpm
    CPU Fan 938 rpm

    and this stats show when i'm just surfing the net (mail is also open but that's it) low fan noise is still audible.
  5. davids8477 macrumors 6502

    Jan 4, 2008
    Here's mine at idle

    Optical Drive 1000
    Hard drive 1098
    CPU 999
  6. fuchsi thread starter macrumors member

    Aug 26, 2010
    thats pretty much equal.
    Are you hearing any fan noise at those stats?
  7. davids8477 macrumors 6502

    Jan 4, 2008
    Its in a very quiet room and I cannot hear anything - even if I put my ear close to the top vents.
  8. TMRaven macrumors 68020


    Nov 5, 2009
    Don't know what to say about audible fans from bootup. Maybe it's all in your head.

    1000/1100/940 is base fan rpms for the iMac. It's very, very quiet, but you will hear them a little bit if you're in a completely silent room and/or stick your ear next to the hdd vent that's under the stand. They are fans, and they're moving parts that displace air, afterall.
  9. fuchsi thread starter macrumors member

    Aug 26, 2010
    I get what ur saying TMRaven.
    but my Post was not about complaning, cause i know there will always be some kind of noise with this machine.
    I mean this forum is all about that kind of paranoia :D

    My issue is the before & after scenario i'm confronting.
    Like i mentioned there used to be no fan sound at all and now suddenly it's there when i boot the system.
    That's what i'm trying to pin down.
    You say the stats are basic, fine but that still doesn't explain the faning
    I can't believe that i heated the cores so much that it still has to cool them days it's something else
  10. TMRaven macrumors 68020


    Nov 5, 2009
    As I said before, perhaps it's all in your head. When I first got my 27 inch iMac, I was coming from the G5 iMac of 2004-05. So naturally, at first, this machine seemed like it was in complete silence the whole time. Now that I'm accustomed to it, I can always hear the very subtle whisper of the fans and the hdd all the time. And speaking of booting up, the most noticeable thing I'm hearing when I boot up the system or wake it from sleep is the HDD revving up to its 7200rpm.

    As for the severity and how loud your fans sound to you, nobody can know for sure unless you provide adequate video with a very good mic. If the difference is night and day to you, then perhaps take it into apple. But with 1000/1100/940, the difference shouldn't be night and day.

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