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  1. #1
    27" iMac Hum Resolved
    VegasGeorge's Avatar
    Member Since
    Sep 23, 2006
    Location
    Las Vegas, NV USA
    Posts
    893
    Specs:
    iMac, and Macbook Pro
    27" iMac Hum Resolved
    My wife's new 27" iMac was producing a noticeable and annoying low frequency humming sound. At first I thought it was coming from the screen, so I shut that down. The hum persisted. Then I put the iMac to sleep. The hum went away. It came back as soon as the iMac woke up. I had visions of hauling it down to the store for a genius bar appointment, etc. Then I turned the iMac around and put my ear to the back of the case to try to isolate the area where the hum was originating. Imagine my surprise when I didn't hear any hum at all. At first I was confused by that. Then I gently picked up the iMac, lifting it off the counter top on which it was sitting. The hum immediately ceased. The hum came back as soon as I set the iMac back down. So it wasn't an electrical hum at all, it was a hum produced mechanically by vibration propagating from the iMac to the glass counter top. The glass was humming. I put fairly heavy felt pads on the bottom of the iMac stand, and the hum is virtually gone. It's no problem any more. And, I'm sure that a more sophisticated vibration dampening solution would eliminate the hum altogether. Just wanted to share the information.

  2. #2
    27" iMac Hum Resolved
    MYmacROX's Avatar
    Member Since
    Mar 17, 2009
    Posts
    3,626
    Specs:
    2008 15" MBP Yosemite, 2012 21.5" iMac Yosemite
    Very interesting.
    Does it matter what apps you're running or does it do it with no apps at all going on?
    64GB iPhone 6, 64GB iPad Air 2.

    Reminder: Please include your Mac's specs. This will make it much easier for the other members to assist you.

  3. #3
    27" iMac Hum Resolved
    VegasGeorge's Avatar
    Member Since
    Sep 23, 2006
    Location
    Las Vegas, NV USA
    Posts
    893
    Specs:
    iMac, and Macbook Pro
    No apps, just Finder running.

  4. #4
    27" iMac Hum Resolved

    Member Since
    Apr 22, 2011
    Posts
    1
    Brilliant! Had my new iMac for just over a week when I noticed this low-pitched annoying hum. Didn't remember it being there when I first booted up. Anyway, checked lots of threads here and was on the verge of reluctantly returning my machine when I came across your post. Tried lifting the machine as you describe and it went! I have a hard floor and desktop and the sound was entirely caused by reflected vibration. Have just put some felt feet under the base and it's now virtually silent. I see Amazon also sell cheap 'vibration-free feet' for exactly this purpose. Thanks for posting your solution, you certainly saved me considerable time and trouble.

  5. #5
    27" iMac Hum Resolved

    Member Since
    Oct 21, 2011
    Posts
    1
    Thumbs up
    Thank you, thank you, thank you! I lifted my iMac 27 from the table, and the humming disappeared!

  6. #6
    27" iMac Hum Resolved

    Member Since
    Aug 26, 2011
    Posts
    11
    I just fittet some sound isolating felt from an old PC to the bottom of my iMac stand, and it removed 80-90 % of the humming :-)

    Thanks for you great tip :-)

  7. #7
    27" iMac Hum Resolved

    Member Since
    Nov 16, 2011
    Posts
    1
    Oh what a relief!! This worked a treat...

    I had this exact problem... annoying low pitch humming noise...

    I've put my iMac on a marble chopping board (!) and its worked a treat. No sound at all now!

    :-D

  8. #8
    27" iMac Hum Resolved
    rafem's Avatar
    Member Since
    Sep 13, 2009
    Location
    Miami, FL
    Posts
    8
    Specs:
    iMac 27 in 2.7Ghz i5 Quad
    Talking iMac hummm
    I want to thank you!! Looking for an answer to another issue I came across your solution and bingo! My hum gone!!
    rafeman, the lightchaser

  9. #9
    27" iMac Hum Resolved

    Member Since
    Jan 31, 2012
    Posts
    6
    Hello,

    I would just like to confirm I have exactly the same humming low pitch very anoying noise in my 27" iMAC. I5, 12GB RAM, 1TB HD.

    I fat book and rubber vibration absorbers under iMAC stand helped a bit but that's not really a solution. I wan't a silent computer. With Apple and 21 cent. I though I might finnaly get lucky. NOT!

    Now it's reading laws, returning to store, talking to service people,...

  10. #10
    27" iMac Hum Resolved

    Member Since
    Nov 09, 2014
    Posts
    1
    Same problem...different solution.
    Quote Originally Posted by VegasGeorge View Post
    My wife's new 27" iMac was producing a noticeable and annoying low frequency humming sound. At first I thought it was coming from the screen, so I shut that down. The hum persisted. Then I put the iMac to sleep. The hum went away. It came back as soon as the iMac woke up. I had visions of hauling it down to the store for a genius bar appointment, etc. Then I turned the iMac around and put my ear to the back of the case to try to isolate the area where the hum was originating. Imagine my surprise when I didn't hear any hum at all. At first I was confused by that. Then I gently picked up the iMac, lifting it off the counter top on which it was sitting. The hum immediately ceased. The hum came back as soon as I set the iMac back down. So it wasn't an electrical hum at all, it was a hum produced mechanically by vibration propagating from the iMac to the glass counter top. The glass was humming. I put fairly heavy felt pads on the bottom of the iMac stand, and the hum is virtually gone. It's no problem any more. And, I'm sure that a more sophisticated vibration dampening solution would eliminate the hum altogether. Just wanted to share the information.

    Thanks, George. A simple and elegant solution.

    Just like Vegas George's original post, my Sweetheart said she couldn't work on the new 27" iMac because of an annoying hum. I read this thread and followed the "felt pad under the iMac" advice, but the hum didn't go away.

    One of the posts, maybe it was George, said the hum went away the moment the device was lifted from the desk surface. When I lifted my Seagate 1T Backup drive, also sitting on the desk right behind the computer, the hum disappeared. Yes! A double thickness of medium felt pad, the kind you put under furniture legs and found at all hardware stores, did the trick perfectly. I took the pad from under the Mac and the hum was still gone.

    So, if you've got a hum and it's not your computer, don't give up. Look around. What else could be using your desk surface like the skin on a snare drum and converting small vibrations into annoying sound? A little exploration can pays off in ways.

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