Take a look here if you have an Intel iMac

Discussion in 'Buying Tips and Advice' started by mac000, May 4, 2006.

  1. mac000 macrumors 6502a

    Sep 6, 2005
    I am wondering from other users if your Intel iMac has a high pitch noise when it is in "sleep" or "shut down"....

    On the back left side of my imac near the vent, there is a rather high pitch noise that sounds whenever teh computer is shut off or in sleep. I am debating whether to take it in to be checked out. Its not a huge deal, but if its a start to some hardware failure I would like to know.

    Anyone else hear this noise? :confused: :confused:
  2. eji macrumors 6502


    Jun 8, 2004
    Inland Empire
    I actually have an AC power supply for my Zaurus PDA that does this. If the PDA is plugged in and on, no whine; if the PDA is plugged in but shut off (and its battery is fully charged), it's a real high-pitched whine that, once you notice it's there, will drive you nuts.

    Are you in Europe? I ask because I am, and the high-pitched whine goes away when I'm in the US on 120v current.

    In other words, it could be a safe but annoying issue with the auto-switching power supply.
  3. truz macrumors 6502a


    Jan 1, 2006
    If you don't have the recommended voltage going to your mac it could be causing issues. Try buying a UPS backup, you can get a belkin 550va on buy.com for $50 USD.
  4. Nermal Moderator


    Staff Member

    Dec 7, 2002
    New Zealand
    Mine does that if my iPod is plugged in (and possibly only when it's charging).
  5. balamw Moderator


    Staff Member

    Aug 16, 2005
    New England
    I've noticed it in the early morning and only if I put my head very close to the iMac, and agree with the assessment that it's probably the switching power supply. I'm quite sensitive to high pitched whines, I can tell when a CRT/TV is on but displaying a blank picture, so it doesn't seem too bad that I don't dwell on it with the Intel iMac.

  6. pilotError macrumors 68020


    Apr 12, 2006
    Long Island

    I have a 20" iMac and haven't noticed any noise whatsoever.

    I can barely hear the Hard Drive, but that CD is a different story!

  7. FFTT macrumors 68030


    Apr 17, 2004
    A Stoned Throw From Ground Zero
    I agree that it's a good idea to use a high quality power conditioner with any
    sensitive electronics.

    When I check voltage before installing an electric meter, the readings vary
    quite a bit.

    The readings can be off by as many as 3-8 volts depending on the cable and the distance to the transformer.
  8. witness macrumors 6502

    Apr 7, 2005
    I haven't noticed any strange noises with my intel iMac, though I occasionally get some backlight flicker.
  9. emmakins macrumors newbie

    May 9, 2006
    Apparently this is "normal"

    Guys, my 20" imac does this and it drives me bonkers cos I can hear it at night.

    I took into the apple shop and the technician said this is normal and that all electrical devices do this. (Which is utter rubbish-my last computer was dead silent whenever it was off.)

    I was annoyed that I had to lug the thing back and be told this.:mad: He said that power was still being used by the device when it's turned off or asleep and that what you can hear. Then why don't I hear it when it's on and awake?
  10. imacintel macrumors 68000

    Mar 12, 2006

    I hear it. It is nnoying(my imac is in my bedroom.
  11. wordmunger macrumors 603


    Sep 3, 2003
    North Carolina
    I don't hear anything. Could be my 39-year-old ears, though.
  12. imacintel macrumors 68000

    Mar 12, 2006

    It is because of the fans. You know how projectors cool off when you're finished using it? It is like that. It is a CPU fan, but not the main one. It is a small fan. There is also one by the Hard Disk.:)
  13. Artful Dodger macrumors 68020

    Artful Dodger

    May 28, 2004
    In a false sense of reality...My Mind!
    My 20" iMac is quiet no matter what so maybe I'm lucky or it is working just fine. The sound (fans) only goes up if I'm doing a heavy load in Flash but not enough to bother me and really, iTunes takes care of any sound that I would complain about when doing so.

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