CPU Fan Speed

Discussion in 'Mac Pro' started by revlimit, Jun 19, 2015.

  1. revlimit macrumors member

    Joined:
    Nov 13, 2011
    #1
    So 1 of my fan on my dual CPU 4,1 is running at full speed. I've tried swapping out heat sink but that didn't resolve the problem. Tried doing the SMC and the PRAM reset as well. I've installed the fan controls but that didn't resolve the issue as well. So it is something within the board that is causing it. Anyone have anything else I can try?
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    Did you install a 4,1 tray into a 5,1 machine?
     
  3. revlimit thread starter macrumors member

    Joined:
    Nov 13, 2011
    #3
    Nope, I installed a 4,1 tray into a 4,1 machine. Could it be possible that the 4,1 tray was firmware upgraded and that the 4,1 machine wasn't?
     
  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    Did you upgrade the CPU by yourself? If yes, any details? e.g. How you did it.

    Is this issue appear all in a sudden?

    Did you see any red LED on the mobo?
     
  5. revlimit thread starter macrumors member

    Joined:
    Nov 13, 2011
    #5
    The CPU is the original 2.26 GHZ. I purchase the board off someone. I have a feeling it maybe a temp diode on the board that's gone bad. I didn't notice any red LED. I was trying to run the Apple Hardware Test but I was unable to start it with instruction discribe on the web of holding the D key down upon bootup.
     

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