iMac (4K, 21.5", SSD, 2017) making wierd noise? Help!

Discussion in 'iMac' started by swealpha, Mar 2, 2018.

  1. swealpha, Mar 2, 2018
    Last edited: Mar 5, 2018

    swealpha macrumors newbie

    Joined:
    Feb 5, 2017
    #1
    Hello!

    My new iMac has started making some wierd noise, I got it 1 week ago and I didnt noticed this until today.

    I dont hear it always, it comes and goes sometimes. I think when scrolling.


    It reminds of a 2.5" 5,400rpm HDD noise when working.


    My system details:
    iMac 4k
    3,4 GHz Intel Core i5
    16 GB 2400 MHz DDR4
    Radeon Pro 560 4 GB
    APPLE SSD 250GB (SM0256L)



    What do you guys think it could be?



    Thank you!

    (This is my first iMac, I had a macbook pro mid 2014 ssd before this.)


    Alternative with better microphone: https://instaud.io/1Rlf
     
  2. Darmok N Jalad macrumors 68000

    Darmok N Jalad

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    Sep 26, 2017
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    Tanagra
    #2
  3. nambuccaheadsau macrumors 68000

    nambuccaheadsau

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    Location:
    Nambucca Heads Australia
  4. Glockworkorange macrumors 68000

    Glockworkorange

    Joined:
    Feb 10, 2015
    Location:
    Chicago, Illinois
    #4
    Yeah, exchange it if you’re in the window.
     
  5. swealpha thread starter macrumors newbie

    Joined:
    Feb 5, 2017
    #5
    Do you guys think it could be worth to buy a UPS? Maybe it will help to remove the coil whine?

    I live in Sweden so the electricity-standard should be kinda ok.. but i dunno, maybe it is not.
     
  6. Darmok N Jalad macrumors 68000

    Darmok N Jalad

    Joined:
    Sep 26, 2017
    Location:
    Tanagra
    #6
    You could try your Mac in a different outlet and see if it goes away? Sometimes the electrical fixtures go bad. I’ve experienced it more than once where I live now. Had a can light fixture that would blow through bulbs in a day.
     
  7. curmudgeonette macrumors 6502

    Joined:
    Jan 28, 2016
    Location:
    California
    #7
    The coil whine is not from your power line. It is from the computer's own switching power supply. Some internal component wasn't glued or soldered down properly.

    Cool story: In a land and time far far far away, I was a summer intern working on a switching power supply running a large motor. The boss's power supply controller was all analog - and the device shrieked constantly. I replaced the controller with an all digital one run by a microprocessor. With a constant motor load, there was now total silence, even though the supply was switching away at 20KHz. With a varying load, a 1KHz SHRIEK!!! filled the lab - my software recomputed the 20KHz duty cycle every millisecond. Conclusion: Coil whine comes from the magnetic components in the power supply having changes in their magnetic fields.
     
  8. swealpha, Mar 4, 2018
    Last edited: Mar 4, 2018

    swealpha thread starter macrumors newbie

    Joined:
    Feb 5, 2017
    #8
    This is how it sounds from the back of the iMac.

    In the begining and in the end of the audio-file you can hear how it sounds when the microphone is not so close to the imac.

    https://instaud.io/1Rlf

    This makes me so angry. Because i think this is because i have customized my iMac.
    Why do apple not sell iMacs with 16GB ram from stock?

    OOhh..
     
  9. haruhiko macrumors 601

    haruhiko

    Joined:
    Sep 29, 2009
    #9
    I don't think RAM has anything to do with noise.
     
  10. swealpha thread starter macrumors newbie

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    Feb 5, 2017
    #10
    Ofcourse not, but if some guy at the applestore opens up the imac from the factory and then tries to install RAM. I think i will not get chocked if he manages to brake something up.
     
  11. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #11
    That sounds like it could be "fan noise" to me.
     
  12. swealpha thread starter macrumors newbie

    Joined:
    Feb 5, 2017
    #12
    Broken fan I think.
    Sometimes I dont hear that sound even due the fan is spinning in high speed.

    Wierd, will send this crap 2500USD back. Grr
     
  13. jgelin macrumors 6502a

    jgelin

    Joined:
    Jul 30, 2015
    Location:
    St Petersburg, FL
    #13
    Check the fans by increasing the RPM through some app, like fan controller or iStat Menus. If the sound happens at the higher speed then you at least know it is the fans. Also, keep in mind that this Mac does run pretty hot and there will be much more noticeable fan noise than in pre-4k models. (you have only one fan to cool both CPU and GPU) If this is not the cause, higher RPM, then exchange to Apple. See if they can do express replacement where they send you a device and once received you send the defective one back to them.
     
  14. swealpha thread starter macrumors newbie

    Joined:
    Feb 5, 2017
    #14
    Thank you for your answer. I am already using smcfancontrol. :) :) Tested.
    It is not a normal fan noise, this is something else. Low freq noise or something. (Link: https://instaud.io/1Rlf)

    And I don't feel like it is getting to hot if i compare with my mid 2014 MBP.
    Running 2x 4k videos from Youtube using Chrome v.64. After 30min, fan speed 1200 rpm and 59C.
    So it is very good imo.

    My idea is to order a new iMac with the same configuration and send this one back for refund when i get the other one.

    - Do you guys think it could be the SSD that makes this wierd noise?
    Because I dont think it is the fan.
     
  15. nambuccaheadsau macrumors 68000

    nambuccaheadsau

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    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #15
    If you stuff about you will get nothing. 14 days from sale date is enforced and suggest removing fan control software before taking it back.
     
  16. swealpha thread starter macrumors newbie

    Joined:
    Feb 5, 2017
    #16
    I contacted apple and they asked me what OS i had and if i could reset the SMC etc.

    I dont think this sh*it has nothing to do with the ugly coil-whine noise.

    I am sooo disappointed at apple.

    My plan is to return and order a new one, will i get the same ugly noise again maybe i could try to fix it using some SMC etc, maybe UPS.

    Thank you for listening to me :D
     
  17. vddobrev macrumors 6502

    Joined:
    Oct 28, 2016
    Location:
    Haskovo, Bulgaria
    #17
    I listened to the recording, and this is a fan noise. Remove your fan control software and see what happens.
     
  18. swealpha thread starter macrumors newbie

    Joined:
    Feb 5, 2017
    #18
    But even when i set my fan speed to maximum or medium that ugly noise is in the background always.

    Thank you for your tips.
     
  19. vddobrev macrumors 6502

    Joined:
    Oct 28, 2016
    Location:
    Haskovo, Bulgaria
    #19
    OK, but just remove your fan control software and let the system control it so that you can rule it out. From your system spec, it looks like the fan is the only moving part. All I hear in the recording is a vibrating sound that seems to originate from a moving part, and to me this is not coil whine.
     
  20. swealpha thread starter macrumors newbie

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    Feb 5, 2017
    #20
    This makes me think about, what happens if i take a backup from this harddisk and install it on the new one. I hope i will not get the error with me lol.

    Maybe best idea to reinstall the system.

    Because, yes i uninstalled the fan controllers but i have no idea if it is 100% uninstalled or 99,9%

    Thank you for your tips!!!
     
  21. vddobrev macrumors 6502

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    Oct 28, 2016
    Location:
    Haskovo, Bulgaria
    #21
    Here is an idea - start in single user mode (Command-S) or recovery mode (Command-R) and let it sit like this for some time, do you hear the noise?
     
  22. swealpha thread starter macrumors newbie

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    Feb 5, 2017
    #22
    I will try this, let say i dont hear it in this mode. What can I do then? Reinstall OS? Thank you
     
  23. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #23
    Do you have 3-pin or 2-pin wall plugs in Sweden?
    If it's just 2-pin, could the "hot" and "neutral" be swapped around?
    If you plug the iMac into a different outlet elsewhere in the house, does it still make the sound?
     
  24. swealpha, Mar 5, 2018
    Last edited: Mar 5, 2018

    swealpha thread starter macrumors newbie

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    Feb 5, 2017
    #24
    3-pin. It has started to make this wierd noise again lol, gaaah.
     
  25. vddobrev macrumors 6502

    Joined:
    Oct 28, 2016
    Location:
    Haskovo, Bulgaria
    #25
    Noting new in this video, still same vibrating sound. Can you concentrate on the conditions that cause this noise vs no noise? For example:

    - leave the computer idle - does it make the noise?
    - stress CPU - does it make the noise?
    - stress GPU - does it make the noise?
    - stress CPU + GPU - does it make the noise?
    - turn off WiFi - does it make the noise?
    - turn off Bluetooth - does it make the noise?
    - turn off WiFi + Bluetooth - does it make the noise?
    --- Post Merged, Mar 5, 2018 ---
    In all honesty, there is nothing productive about this thread. It is confirmed the machine makes noise that you are not comfortable with. What is it that you want to achieve? Your machine is brand new, I do not suppose you will start repairing it yourself, even if we find out what/when makes the noise. Why not just return it and get another one.
     

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28 March 2, 2018