fans working too mutch

Discussion in 'Mac Pro' started by zoran, Mar 11, 2010.

  1. zoran macrumors 68030

    Joined:
    Jun 30, 2005
    #1
    Its very strange because my dualPowerMac fans are working like crazy at some certain point after a task. Then the system crashes. What might be causing this noise fan behaviour? The only solution to make it stop is by clicking the power on/off button., but as you can understand thats definately not a way to carry on!
     
  2. Marty62 macrumors 6502

    Joined:
    Mar 11, 2010
    Location:
    Berlin formerly London
    #2
    I've had this a few times on both G5's and MacPro's
    It was simply "dust" inside the case !
    A good "take apart" and careful cleanout sorted the problem.
    On my last macpro V 1.1 - Quad 2.66 it was "screaming" for a while and this
    was the graphics card being covered in a dust layer ! ( it's small fan went crazy)
    Get it off your boards / fans and memory
    I have to do this every 2 months to keep mine clean and quiet.

    MM.
     
  3. zoran thread starter macrumors 68030

    Joined:
    Jun 30, 2005
    #3
    also let me say that the computer first freezes and then the fans start to go crazy! what can i check for? i have already repared permissions etc!
     
  4. rickvanr macrumors 68040

    rickvanr

    Joined:
    Apr 10, 2002
    Location:
    Brockville
    #4
    Give it a good blow.

    .. and then do it again

    When the fans go crazy after a crash, does a red light turn on in the inside? What kind of G5 do you have?
     
  5. zoran thread starter macrumors 68030

    Joined:
    Jun 30, 2005
    #5
    well its a dual1.8, but where exactly is the red light inside?
     
  6. zoran thread starter macrumors 68030

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    Jun 30, 2005
  7. zoran thread starter macrumors 68030

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    Jun 30, 2005
    #7
    ...its lit when its works but when the mac freezes/crashes the red light is no longer lit
     
  8. zoran thread starter macrumors 68030

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    Jun 30, 2005
  9. macz1 macrumors 6502

    macz1

    Joined:
    Oct 28, 2007
    #9
    On a G5, you can solve this problem by changing a setting in the energy saver control panel. You have to change the CPU speed to low or something similar. It will lead to a better power management and should not cost speed.
     
  10. zoran thread starter macrumors 68030

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    Jun 30, 2005
    #10
    i tried it but didnt solve the issue!
    :(
     
  11. macz1 macrumors 6502

    macz1

    Joined:
    Oct 28, 2007
    #11
    As it seems, the problem is actually he crash and not the fans spinning fast, which seem rather to be a secondary effect (fail-safe)...

    Is the problem reproducible?
    Did you do something CPU-intensive right before that?
    Did you add more RAM recently?
    Did you try to boot from another volume / OS?
    Did you check the system log in the console? (might give some info about the crash)

    That's all I can suggest at the moment...
     
  12. zoran thread starter macrumors 68030

    Joined:
    Jun 30, 2005
    #12
    Thanx for the tips, but now actually there was some work done on the mac, one of the cpus had and issue and was replaced so there are no crashes now, but now like i said the fans are spinning like crazy, still system will not crash!
     
  13. goMac macrumors 603

    Joined:
    Apr 15, 2004
    #13
    This doesn't sound like a fan issue at all. This sounds like a kernel panic. When the machine panics, the fans will go up to full blast because the fan control extensions have dropped off.

    Something is wrong with your OS, or some other hardware.

    (Edit: saw your latest post. Don't the G5's need to be fan tuned after a CPU is replaced?)
     
  14. zoran thread starter macrumors 68030

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    Jun 30, 2005
    #14
    Fan tuned? very interesting, that might be something to search for! How can the G5 be fan tuned?
     
  15. goMac macrumors 603

    Joined:
    Apr 15, 2004
    #15
    End user can't do it. But the Mac tech who replaced the processor is supposed to. I never owned a G5, but I recall something about a cd needing to be run after a processor is replaced.
     
  16. zoran thread starter macrumors 68030

    Joined:
    Jun 30, 2005
    #16
    it seems i have to do it on my own cause i cannot spend any more money for this mac, if anyone can help me on this it be cool!
     
  17. goMac macrumors 603

    Joined:
    Apr 15, 2004
    #17
    You've got to get the Apple Service Disk.

    http://hintsforums.macworld.com/showthread.php?t=61523

    Was your tech Apple authorized? He should have done it for you.
     
  18. zoran thread starter macrumors 68030

    Joined:
    Jun 30, 2005
    #18
    well the company i work for (G5 belongs to the company) thought that the cost was big to spend on fixing an old G5, and also i must say that the companies ITdept the only care about pcs because they are cheaper, so now i have no alternative other than trying to fix it on my own! :mad:
     

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