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  • Guillermo Buelna Level 1 Level 1 (0 points)
    Thanks a lot, last night I was blogging, and I fix the bright down, it was ok.

    This morning I start the computer and I heard the buzz sound, I was concerned about this, I read your post and I fix the screen bright y the buzz disapear, thanks a lot I´ll go to the apple store for a fix up...
    I change the bright and the buzz soun came again.

    thanks again...
  • MattyNelson Level 1 Level 1 (10 points)
    My iMac makes a strange sound too, but only when i am using windows vista...
    It happens when the computer makes that vista startup sound and it goes all crackly, but i think it is just the video driver clashing with the sound one because well... you know windows.....
    And the sound also seems to happen when i have the sound turned down really low...
    I dunno what to do?
  • Prowle Level 1 Level 1 (0 points)
    I'm having exactly the same issues, but with Windows XP rather than Vista. Is there anyone out there with a solution, or will this new Mac turn out to be as unreliable as my old Dell?
  • Bob Forsberg Level 1 Level 1 (0 points)
    I just received an all white, late 2006 model, 24" iMac from the Apple referb store with the screen buzzing problem you describe as a screen inverter issue. It replaces my 17" all white, late 2006 model that didn't have a buzzing issue.

    Thanks for your insight and those posting here about this screen inverter buzzing sound. I'll make an appointment with my local Apple Store in Irvine CA to have it fixed.
  • dncrtiger Level 1 Level 1 (0 points)
    Hi,

    Looks like I have the same problem on my new 20" iMac. Buzzing sound goes away on full brightness and on minimum brightness, but comes back whenever I have it set anywhere in between. Has anyone found out how to stop this, or is this something where we have to take the computer back for repair/replacement? Mine is less than two weeks old.

    Please let me know.
    Thanks

    Message was edited by: dncrtiger
  • dncrtiger Level 1 Level 1 (0 points)
    Hi,

    Looks like I have the same problem on my new 20" iMac. Buzzing sound goes away on full brightness and on minimum brightness, but comes back whenever I have it set anywhere in between. Has anyone found out how to stop this, or is this something where we have to take the computer back for repair/replacement? Mine is less than two weeks old.

    Please let me know.
    Thanks
  • myhighway Level 5 Level 5 (7,270 points)
    Yes, check post #11 by member Joe Sayer - this is a hardware issue that software updates will not fix.
  • Bakht Level 1 Level 1 (45 points)
    Hi all!

    I just bought a 24" iMac 2.4GHz Core 2 Duo. When I use my iMac in an almost sound-proof room, I can hear this very low pitched rumble. My fans constantly run at approximately 1200 RPM for CPU, GPU and approximately 700 for the Optical Drive as reported by iStat Pro widget. As reported by other users in this forum that the noise goes away with changing brightness levels, mine does not seem to have similar issues, which happens to be a faulty inverter. So commensurate with the RPMs exhibited by the three fans is this sound level okay? I mean I did not have it on my previous Intel based iMac (Mid-2006), just a slight whisper.
  • myhighway Level 5 Level 5 (7,270 points)
    When I use my iMac in an almost sound-proof room, I can hear this very low pitched rumble.


    So commensurate with the RPMs exhibited by the three fans is this sound level okay?


    Yes.

    And the farther away from the wall behind it that you can place your iMac, the more quiet it will be. There are other alternatives as well - decorating with sound-deadening materials such as draperies or wall coverings behind the iMac, or otherwise wisely positioning more soft, sound-diffusing items behind it rather than hard, reflective items (glass, metal and paneling).

    I did not have it on my previous Intel based iMac (Mid-2006)


    I wouldn't compare that 17-inch to your 24-inch.
  • Bakht Level 1 Level 1 (45 points)
    myhighway, thats reassuring!
  • imagem44 Level 1 Level 1 (0 points)
    I had a whirring/buzzing noise emit from the lower rear right "quadrant". This occurred infrequently, not withstanding power "on" duration nor lifespan of this unit: It came off the shelf just after Christmas. The problem hasn't occurred lately, however, the headphone output no longer functions. The built-in speakers still operate, even when headphones are connected.
  • Joe Blog Level 1 Level 1 (0 points)
    I bought a 20" iMac in Dec. 2007. Recently (like a week or so) I've noticed a humming/buzzing sound coming from the back as several of you have mentioned. I only noticed when I was adjusting the height of the display and the sound stopped. It's come back several times and I've usually put a slight "twist" on the casing to make it go away, but lately, that doesn't work at all, and I'm not going to make a pretzel out if my Mac trying to find its threshold. From what I gather, it needs to go "into the shop" to get the inverter replaced. What I want to know is, if I just turn the music up a bit louder, how long can I wait? And why did they make this thing so hard to get into anyway?
  • ernie2249 Level 1 Level 1 (0 points)
    New 24" alum imac. Machine is about 1 month old. At first the machine was super quiet. Now I have a low level vibration sound coming from the lower right side (when looking at the machine). If you feel the unit in that location, you can feel the vibration. Noise seems to go away when the machine goes into sleep mode. Does anyone know what is located in that part of the machine? Is it one of the fans? Since I bought the extended warranty, I guess I have some time before I need to take this somewhere for a look at. Is Apple aware of all these noise problems?
  • seventy one Level 6 Level 6 (10,700 points)
    You might like to check what back up unit you use. I installed an Iomega unit which I found caused a vibratory sound through my mac which increased when I physically picked up the aluminium keyboard. It appears that repositioning the back up unit onto a more stable surface is all that is necessary. All of my background buzzing has disappeared.
  • myhighway Level 5 Level 5 (7,270 points)
    Welcome to Discussions, ernie2249

    Only you know if the noise you hear is a serious noise or not. If it's serious, getting it checked out or repaired would be better than finding out you have a hard drive going bad that will take all your data with it.

    Is Apple aware of all these noise problems?


    "all" - what all?

    Sorry, but what noise problems are you referring to? Those in this thread or another thread/threads?The alum iMac is very quiet, as was the prior model of Intel-based iMac. This thread was started nine months ago (prior to the alum iMac introduction) and has had mostly non-similar, piggy-backed issues from about two dozen other users, never a good way to get answers.

    Perhaps you could link some of the other "noise" threads that refer to the alum iMac, as I've looked and don't see any recent ones.