CPU and HD fans at 0 while running

Discussion in 'Mac Pro' started by jeeplj8, Jan 11, 2014.

  1. jeeplj8, Jan 11, 2014
    Last edited: Jan 11, 2014

    jeeplj8 macrumors member

    Joined:
    Jan 4, 2014
    #1
    I thought after some upgrades my MacPro sounded awful quiet...

    iStat shows the CPU and the HD/Expansion fans at 0 RPM. Admittedly, temps overall look very stable and normal, but shouldn't the fans be spinning a little?

    actually memory seems a little hot:
    CPU temps range from 21-31
    Memory 61-72
     
  2. paulrbeers macrumors 68040

    Joined:
    Dec 17, 2009
    #2
    The fans are running just not registering. Your mac would overheat in a second if the fans weren't running. Temps look fairly normal.
     
  3. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #3
    Those fans (CPU and HD) would be the large fans, immediately behind the front panel. You can easily check to see if those fans start turning when you turn on the the computer (shut down completely, then notice the fans are not turning, and watch the fans while you press the power button), or you should be able to see from the front that the fans are turning - they will ALWAYS be running when power is on.
     
  4. jeeplj8 thread starter macrumors member

    Joined:
    Jan 4, 2014
    #4
    they are running, slowly, but istat shows 0 rpm. is there something I could have knocked loose when I removed them to get tot the SATA connectors?

    Thanks for the info
     
  5. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #5
    Yes, you could have left a connector loose - however, if that happened, the fans wouldn't be running at all. You can always use one of the fan control apps to force the fans to a higher speed, just as a test. If you CAN'T control the fan speed, then that would be a different issue, too.
     

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