My Mac is whining...

Discussion in 'Mac Pro' started by norda72, May 27, 2016.

  1. norda72 macrumors newbie

    norda72

    Joined:
    May 27, 2016
    Location:
    Bollnäs, Sweden
    #1
    I have an Mac Pro mid 2012 which I bought in April 2013. Immeadiately when I turned it on the first time I heard an annoying wining sound which I haven´t heard from the Mac Pro early 2008 I owned before. All since then I get disturbed by the sound, which can be heard a couple of meters from the computer. I have had it to service at Apple-center two times during the warranty time, and the second time they changed graphic card, but even as today I hear the sound and find it disturbing. The computer has 8 fans, I believe, and I don´t know which one of them who is the soundmaker. When you turn the computer on you can hear a even higher wining sound which decreases when it has been going for some minutes. The computer is an 3,2 Ghz 4-core-computer with SSD Samsung ECO 850 and 20 gigabytes memory (out of 32). This has gone so far so I think of buying another one, a used one on Macsales.com, but they are very expensive even if they are from 2010 or earlier. Saw one with 12 cores which costed almost 4 000 dollars (almost 32 000 Swedish Crowns). I can´t afford it... What can I do about this? I am satisfied with the computer, except from it´s 2.0 USB-connection and no HDMI or Thunderbolt...

    With regards
    Pär Nordqvist, Sweden
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    $20 Inateck KT4004 will give you USB 3.0

    Most modern GPU have HDMI output (7950 or GTX 680 has factory Mac Edition card, but they are expensive, you can get the same model's PC card and then flash it by yourself. A used card may as low as $100)

    Back to the sound issue. It's hard to tell where is the source, but possible from the PSU. If it's from the fan, they usually only occur at a particular RPM, so very easy to verify (use fan control software to alter the fan speed one by one).

    If it's from the PSU, change the demand may change the sound. e.g. Most of the CPU / GPU benchmark software can achieve that.

    Another possible source is the HDD tray. I experience this once before, may be I did tighten the screw properly on one of the HDD, so the tray vibrate and making some funning noise. The noise is not loud, but high pitch, so easy to notice, but hard to fine out the source. It annoyed me for quit a long time, until on one occasion, I open the side door when the noise is there, the noise suddenly disappear. Since the door lock will lock the HDD tray as well, so I give all HDD tray slightly push (one by one), and finally able to pin point the source and fix it.

    Another forum member also reported his noice is from the processor cage, just need a piece of paper to fill the gap, and the noise stop.
     
  3. norda72 thread starter macrumors newbie

    norda72

    Joined:
    May 27, 2016
    Location:
    Bollnäs, Sweden
    #3
    --- Post Merged, May 27, 2016 ---
    Thank you for your answer! PSU, is that powersupply unit, or is it something else?
     
  4. owbp macrumors 6502a

    owbp

    Joined:
    Jan 28, 2016
    Location:
    Belgrade, Serbia
    #4
    Yes it is.
     
  5. norda72 thread starter macrumors newbie

    norda72

    Joined:
    May 27, 2016
    Location:
    Bollnäs, Sweden
    #5
    "If it's from the PSU, change the demand may change the sound. e.g. Most of the CPU / GPU benchmark software can achieve that." What shall I change? What demand?
     
  6. owbp macrumors 6502a

    owbp

    Joined:
    Jan 28, 2016
    Location:
    Belgrade, Serbia
    #6
    He was speaking about pressure you put on PSU. So if PSU is the source of that sound it should be different when system is idle from the sound when CPU an/or GPU are at full load.
     

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