Clicking/Ticking noise when iMac is sleeping or turned off?!

Discussion in 'iMac' started by rmwebs, May 31, 2008.

  1. rmwebs macrumors 68040

    Joined:
    Apr 6, 2007
    #1
    Hi,

    I've had my iMac since last april and its always had this ticking or clicking noise when its sleeping or powered off, but still plugged in. I've also noticed that if I leave a firewire or USB hard drive attached (but turned off) it makes a very quiet electrical noise, almost like morse code (again, only when its in sleep or off).

    I usually put the iMac into deep sleep at the end of the day, to preserve power (we all have to do our bit :p).

    Its always worked fine, no problems...but I really wanted to know if:

    A) Its a known "issue"
    B) If it will damage the system
    C) Why does it happen
    D) What causes it?

    Anyone care to shed any light on this?

    Thanks :)

    Rick
     
  2. gehrbox macrumors 65816

    gehrbox

    Joined:
    Jul 5, 2007
    Location:
    Charleston,SC
    #2
    I have a 3.06 24". I've only had it a few days. No ticking or clicking noise at all. I've heard the fan purr quietly once or twice while making it do a bunch of heavy processing, but most of the time the only way I know it is on is the display being lit. I never shut it off, but it does go into sleep mode on its own after an hour. I have 2 MyBook drives plugged into it. One USB and the other firewire.

    Found the following links to ticks, clicks and hums (Google is your friend):

    http://www.ehmac.ca/mac-ipod-help-troubleshooting/61303-near-silent-ticky-aluminum-imac.html

    http://forums.macrumors.com/showthread.php?t=408912

    http://discussions.apple.com/thread.jspa?threadID=1184326

    http://discussions.apple.com/thread.jspa?messageID=7196630&#7196630

    http://discussions.apple.com/thread.jspa?messageID=7185080&#7185080

    http://discussions.apple.com/thread.jspa?messageID=7187072&#7187072
     
  3. rmwebs thread starter macrumors 68040

    Joined:
    Apr 6, 2007
    #3
    Mines deffinently only when sleeping/off. If I leave the firewire drive plugged in, it goes mental and I get a (very quiet) morse code squeeling. The second I unplug the drive, it stops and the clicking resumes. If I pull the power lead out of the wall, it stops alltogether, put it back in and it starts again!

    Everyone who is having a clicking noise seems to not have it when in sleep/off.
     
  4. talkingfuture macrumors 65816

    talkingfuture

    Joined:
    Dec 4, 2008
    Location:
    The back of beyond.
    #4
    Did this ever get sorted. Mine does something similar. It clicks when I put it to sleep after extended use where it has got quite hot. The clicking stops after 5 mins when it has cooled a bit.
     
  5. Michaelgtrusa macrumors 604

    Michaelgtrusa

    Joined:
    Oct 13, 2008
    Location:
    Everywhere And Nowhere
    #5
    Mine sounds as if it's trying to turn back on! Haven't found the issue yet.
     
  6. MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #6
    the clicking when sleep or off after use is just a natural thing , caused by the alloy , when alluminium gets hot it expands a lot and when its cooling down its shrinking again ,which is causing the noise , ping ping click , you can hear it best on a motorcycle engine , nothing to worry about
     
  7. Michaelgtrusa macrumors 604

    Michaelgtrusa

    Joined:
    Oct 13, 2008
    Location:
    Everywhere And Nowhere
  8. MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #8
    the imac made of different metals aluminium outside and very likely a other metal inside somewhere . where there is contact of aluminium and other metals the aluminium is shrinking 3 times that of steel for example when it's cooling down , they didnt chose alloy only on design criteria alloy is a good metal to cool things down fast ,so it tends to creep over the other metal , that's what causes the sound.
    Don't worry it's normal.
     
  9. knowpeace macrumors newbie

    Joined:
    Oct 18, 2010
    #9
    Mine makes that click noise or tick noise only when it is sleeping, and I noticed in the dark, that there's a tiny spark of light from under my imac every time there's that noise. it's annoying and it only stops when I wake it up. I don't think it's the aluminum shrinking which causes the spark!
     
  10. MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #10
    SPARKS:eek: , then keep it off , unplug it from mains ,dont touch it any more and bring it to apple ....i hope you had bought apple care ;)

    there should be no sparks never ever from a computer , its not a engine , there are no spark plugs fitted inside the iMac
     
  11. rmwebs thread starter macrumors 68040

    Joined:
    Apr 6, 2007
    #11
    Just noticed this was still active :)

    It never got sorted. Even after a logic board replacement for a faulty USB bus.

    Also, this was on a white (plastic) mac, not an alu one - so unlikely to be metals making the noize. Plus, if you unplugged it at the wall it stopped.

    It's been replaced with a Mac Pro now however so I never did find out the cause!

    Although, I've now got the MagSafe power box for my MBP making whining sounds...it seems all Apple products I own have some form of defect :rolleyes:
     

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