iMac Fan Issues

Discussion in 'iMac' started by dylan, Oct 26, 2006.

  1. dylan macrumors 6502

    Jul 9, 2005
    Just got my replacement "20 iMac C2D today and the fans sound really off. I recorded a short clip. It is on for the first bit then I put it to sleep, then I started it up again.

    Have a listen.

    My main concern is the "moo" noise at the end. Sounds just like my MacBook did.

    Also I matched the volume at about 50% with iTunes on full so if you could tell me if it is louder or quieter than yours that would be great.
  2. governor macrumors member


    Aug 31, 2006
    That was the sound of you first setting your imac to sleep, and then shortly after wake it up.. i guess?


    I have dealt with 4 or 5 new intel imacs.. both core duos and core 2 duos.

    Some of them are a bit louder than the other ones, but i concider yours to sound like a typical imac, even thoug your fans seems quite loudy.
    The fans speed up when you push the button, and thats the "mooo"-sound. Perfectly normal!

    As long as your fans doesn't make ticking fanblade scraping noises (like a kitchen clock) or blow like a hairdryer, you don't have to worrie.

    The fan-speed can reduce a bit if you reset SMC (unplug everything mouse , ipod , powercord etc. from your imac, and plug it back in after 15 seconds. then press powerbutton)

    You can also try zapping your PRAM..
  3. dylan thread starter macrumors 6502

    Jul 9, 2005
    I am aware there should be one "woosh" but I haven't heard the "moo" before. It is delayed about 2 seconds and sounds really odd in person. I have dealt with a few iMacs as well and never heard this.

    I know it shouldn't be a big deal but after all the problems I had with the MacBook I was really hoping the iMac would be problem free.
  4. imacintel macrumors 68000

    Mar 12, 2006
    My iMac makes the exact noise!

    I knew there was something funky about this computer..
  5. skunk macrumors G4


    Jun 29, 2002
    Republic of Ukistan
  6. mongoos150 macrumors 6502a


    Sep 20, 2005
    PRAM has nothing to do with fans!!!!!
  7. rmhop81 macrumors 68020


    Apr 4, 2005
    Dallas, TX
    you are only hearing that when you are awaking it from sleep correct? all imac's make that noise. That's just the whole machine firing back up to work again. Mine does friends does it....the apple store machines do it too. I wouldn't worry about it. It's not like it moo's when u are just working on it only waking it
  8. dylan thread starter macrumors 6502

    Jul 9, 2005
    Correct but, for the last time, I am talking about the second noise. It's at the very end. Not quite a "moo" but very close. It sounds like a something is interfering with the fan. I definitely did not have this noise on the last one.

    I think this is why the computer is louder than normal.
  9. MacDraw macrumors newbie

    Mar 12, 2008
    iMac ticking fan

    I've got a new, 3 week old, 24" intel 2.8GHz iMac. 2 gig with a ticking CPU fan. Seems to becoming more and more frequent. Getting angry. With smcfancontrol I have to set that fan to 3000 loud! rpms just to get the ticking to stop. Even then I can still kind of hear the ticking, just very fast. Loose axle? Are the people at the Mac store going to give me a song and dance if I take it to them. Cuz if they do I'll throw things, I don't want to throw things.
    Please, is there a fix. Or do I have to make the call and put my boots on.
  10. daniel huxtable macrumors member

    Feb 21, 2008
    east chicago, indiana
    woke up this morning and noticed a tiny ticking/humming noise coming from the fans as well. i have the same iMac model as you except my fan controls are set to their default levels. its low but it is still noticeable if it is quiet in my room. not to worried about it since i have applecare but it is a bit annoying to hear.

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