New Mac Pro, weird clicking sound, please help

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

  1. AdiosVista macrumors 6502

    Sep 10, 2008
    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


    Aug 1, 2008
    Under a rock.
    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

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

    Sep 10, 2008
    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

    May 6, 2008
    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

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

    Apr 4, 2009
    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

    Mar 17, 2009
    Me its normal i thing..i was worried for a moment..
  9. nanofrog macrumors G4

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

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

    Jun 3, 2007
    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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