Humming sound from new Imac 27"

Discussion in 'iMac' started by Langee, May 4, 2011.

  1. Langee macrumors newbie

    Joined:
    May 4, 2011
    #1
    Hi all

    i just picked up the new 27" imac and switched it on. And it is constantly humming with a low dimming sound. Its high enough to notice it when around 2 meters from the machine.

    Is this normal on all imacs? i must admit im getting pretty tired of listening to it so if that is the standard I dont look forward to using my imac :(
     
  2. Shaun.P macrumors 68000

    Shaun.P

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    Jul 14, 2003
    Location:
    Omicron Persei 8
    #2
    Does the noise change when you alter the screen brightness?
     
  3. Langee thread starter macrumors newbie

    Joined:
    May 4, 2011
    #3
    no. i tried that as i saw a lot of people had that problem on the 2010 version but no luck.

    The humming is constant no matter the brightness
     
  4. jamper macrumors newbie

    Joined:
    Apr 3, 2011
    #4
    my mid 2010 21,5" imac does that sound. when i lift him off the table the sound disappears.
    It's something vibrating
     
  5. dwarnecke11, May 4, 2011
    Last edited: May 4, 2011

    dwarnecke11 macrumors 6502

    Joined:
    Nov 29, 2009
    #5
    My guess - either a defective hard drive or bad PSU. Is the sound louder near the upper left of the machine? This is where the PSU is. My '10 i7 iMac makes a faint buzzing at low brightness when its hot from sustained CPU load. Not obtrusive, though.
     
  6. jamper macrumors newbie

    Joined:
    Apr 3, 2011
    #6
    I feel some vibration on the table where my imac is.
    When i lift the imac, the vibration disapears. also the huummmm sound disapears.
    I think it isn't a normal behavior. If you can easily change for another imac, go for it.
    I didn't change mine because this was the 3rd imac, due yellow tint
     
  7. ratherbfishn macrumors newbie

    Joined:
    Mar 30, 2011
    #7
    Return?

    When I bought my imac years ago, it made a loud, vibrating, squeal right out of the box. It was so long ago, I forget if it was a hard drive or fan. After a couple tries with phone support, I took it back and was given a new one.
     
  8. Langee thread starter macrumors newbie

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    May 4, 2011
    #8
    just noticed that when i lift the imac from the table the sound disappears
     
  9. jamper macrumors newbie

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    Apr 3, 2011
    #9
    So we have the same issue. Again, mine is a mid 2010 21,5"
     
  10. trackbikes macrumors regular

    Joined:
    Mar 29, 2011
    #10
    I had this when i got an imac a few weeks back... it's your desk. seriously!

    Have a look at my previous threads and you'll find the details of the post and how i fixed it.

    edit...... => this post... http://forums.macrumors.com/showthread.php?t=1137139&highlight=

    Picked up a new 2011 iMac today and had the same thing, isolate the imac from the desk and it will go.
     
  11. jamper, May 4, 2011
    Last edited: May 4, 2011

    jamper macrumors newbie

    Joined:
    Apr 3, 2011
    #11
    I had 2x 21,5" on the same desk, at the same spot and none of them made the noise. Just this one, the 3rd 21,5"

    Edit: the first 2 imacs were the low 21,5". The 3rd is the high end 21,5". The hdd is different on my 3rd imac(1TB)
    I read the thread you linked and i agree that it must be something related with the hdd
     
  12. Langee thread starter macrumors newbie

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    May 4, 2011
    #12
    tried moving it around and as noted above the sound decreases and increases depending on where it stands. guess itspropably the desk then
     
  13. trackbikes macrumors regular

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    Mar 29, 2011
    #13
    yep... bet it's quieter closer to the corners, I found some cheap noeprene mousemats worked well
     
  14. Noisy macrumors newbie

    Joined:
    Dec 27, 2011
    #14
    imac 2011 noisy hdd

    that's a very known issue caused by WD hard drive which has FALS in its model name. = WD Caviar Black 1 TB (not even the latest 1 Tb model offered by WD, still used by Apple in 2011).
    this drive is too much vibrational to be used in a system like iMac and I think you have a right to request a replacement. 2011 Seagate models used in iMacs are reported to be quiet.

    Hitachi 2 Tb drive is also emitting a humming noise which is very recognizable in a silent room.
     
  15. Yury, Feb 22, 2012
    Last edited: Feb 22, 2012

    Yury macrumors newbie

    Joined:
    Jun 26, 2011
    #15
    Confirm that Noisy said.

    http://www.youtube.com/watch?v=FYs-uKDR4pM

    This is WD stock HDD FALS model. I have the same sound with that HDD.
    I've figured that it depends on where the table with imac lays on. I got this humming sound only in one room. In other's - no sound.

    Another thing is that my table base on metallic frame. And I think that the structure of the table, and the evenness of the floor finish in conjunction with the vibration of HDD create this resonant sound.

    I see only solution - change stock HDD to HDD Green Serie or better SSD.
     
  16. IndustrialSpace macrumors 6502a

    Joined:
    Dec 31, 2009
    Location:
    somewhere
    #16
    All iMacs make a slight buzz... its normal and expected.

    ..in fact, all machinery makes small noises...its your tolerance or awareness level which is probably high.
     
  17. dwarnecke11 macrumors 6502

    Joined:
    Nov 29, 2009
    #17
    I have the 1 TB WD drive and have never felt or heard any vibration. My guess is either you got a dud or your rubber hard drive bushings are faulty.
     

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