New Mac Pro, weird clicking sound, please help

Discussion in 'Mac Pro' started by AdiosVista, Sep 27, 2008.

  1. AdiosVista macrumors 6502

    Joined:
    Sep 10, 2008
    #1
    Please help! Just bought today, brand new mac pro 8 core 2.8ghz. I get a weird click on both boot and start up or when I put the computer to sleep or wake it. It's a single click, imagine the sound of someone lightly flicking the side of an empty Pepsi can. It's not random, I can make it do the sound simply by unplugging or re-plugging the power cord in the back. Is this normal?! Would anyone mind unplugging their mac and seeing if you hear a similar sound please?
     
  2. Metuas macrumors regular

    Metuas

    Joined:
    Aug 1, 2008
    Location:
    Under a rock.
    #2
    It's normal when plugging or unplugging the PSU. I get it sometimes when waking up my G5, but not when booting up.
     
  3. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #3
    Don't panic. :p The sound is from the relays in the PSU, and is normal. :)
     
  4. AdiosVista thread starter macrumors 6502

    Joined:
    Sep 10, 2008
    #4
    Just to double check, are you saying it's normal to hear this noise even when booting/shut down and sleep/wake?
     
  5. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #5
    Yes, AFIAK. :)

    From a previous thread, it seemed Apple had changed OEM suppliers for the PSU.

    It would also make sense that the design is also different. The clicks are likely the switching on/off of voltage sources as they are needed or not. You hit the power switch/wake, it causes certain rails to go on, and off when shutting down/sleep.

    This would be in order with your description of a single click during each event. If it's a rapid/repetitive clicking, that would be another story. :p

    Hope this makes sense. :)
     
  6. AdiosVista thread starter macrumors 6502

    Joined:
    Sep 10, 2008
    #6
    Makes perfect sense, thank you very much!
     
  7. Mac&CheeseWBroc macrumors newbie

    Joined:
    Apr 4, 2009
    #7
    Mac Pro Click on Wake

    I've experienced the same thing: single click at the very moment I tap the space bar or mouse to wake up the computer.
     
  8. Whiteyez macrumors regular

    Joined:
    Mar 17, 2009
    #8
    Me too..so its normal i thing..i was worried for a moment..
     
  9. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #9
    Yes. :) It's the relays. As mentioned, it's only a problem if it's repetitive.
     
  10. soldierblue macrumors 6502

    Joined:
    Mar 23, 2009
    #10
    Yeah, the two G5s and the MP I've had all do this. Relays.
     
  11. Nik macrumors 6502

    Joined:
    Jun 3, 2007
    Location:
    Germany
    #11
    The sound is normal and really cool by the way. :)
    The fans also make a "woosh" when turning off the machine.
     

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