Intermittent noise on 2010 Mac Pro

Discussion in 'Mac Pro' started by scott94, Feb 28, 2011.

  1. scott94 macrumors newbie

    Feb 28, 2011
    Hopefully one of you guys can tell me what might be causing this. I've had 2 identical machines - 2010, 3.2 Ghz Quad. The first was refurbished, the current one, brand new (as of early Feb). Both machines have this identical, periodic noise. It's a short (1/2 second or so) 'whine' / 'spinning down' sound. I originally thought it was a drive going bad, but found that not to be the issue. My only other guess is that it might be a fan? At this point, troubleshooting has consisted of swapping drives and resetting the PRAM.
    Any help greatly appreciated!

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  2. biker joe macrumors newbie

    Aug 9, 2010
    I don't have an answer for you but can sympathize. Mine makes the exact same noise. Very annoying. I would be interested to know what is causing it. It has got to be a HD or a fan.
  3. scott94 thread starter macrumors newbie

    Feb 28, 2011
    After disconnecting several of the easy-to-get-to fans individually, I came to the conclusion that they were not the cause. Next, I removed the superdrive. Again, the noise persisted. This brought me back to the drives.

    When I first received this machine, I set the 'Put the hard disk(s) to sleep when possible' option in Sys Prefs > Energy Saver to off (unchecked). I left the 'Computer Sleep' setting at the default. As an attempt to alleviate this noise, I set 'Computer Sleep' to 'Never'. Gladly, today makes one week without noise!

    With the previous settings, I'm guessing the machine was repeatedly attempting to enter sleep mode and would begin a spin-down of the drives (which I now believe to be the cause of the noise). However, as the drives were set to never sleep, the machine was also not allowed to sleep.

    For anyone interested, I have the stock WD 1 TB (WD1001FALS) and a WD 2 TB (WD2001FASS).
  4. Johnf1285 macrumors 6502a


    Dec 25, 2010
    New Jersey
    Yeah thats definitely the sound of a disk spinning down, or attempting to. Good to hear you solved the problem. I personally set the energy pref's to the follow:

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  5. handheldgames macrumors 65816


    Apr 4, 2009
    Pacific NW, USA
    Noisy drive says "I'm gonna fail soon". Grab a copy of disk radar and take a look.

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