Previous 1 2 Next 15 Replies Latest reply: Dec 16, 2010 12:05 PM by Scanthebarcode
Perry Gershon Level 1 (55 points)
Not sure what to do. Stops when machine sleeps, resumes after 5 min of use. Reset SMC. Reset PRAM. Rebooted. Not sure what else to try.

Graphics processor D temp 124 degrees F
Graphics heatsink temp 120 degrees F
Main Logic Board 115
CPU cores 1-4 89-91 degrees F

highlights above from Hardware Monitor

Intel Mac Mini, Mac OS X (10.6.3)
  • nachdenki Level 3 (635 points)
    the fans are supposed to run all the time. at which speed are they running? download istat pro to find out, then post here.
  • Perry Gershon Level 1 (55 points)
    It took a few days because the problem had stopped, but now it is back. The fan in question is the CPU fa. It normally runs at about 1000 RPM (like the Hard Drive fan and Optical Drive fan. Occasionally, however, it runs at 4000 RPM and makes a lot of noise. Further, it is hard to get it to slow down (sleep mode seems to finally do the trick). The fan gets initiated at 4000 RPM by Flash files, among other things. GPU Diode and GPU heatsink are at 45 degrees C, everything else seems to be at about 35 degrees or less.

    Any ideas what I can do about loud fan?
  • dre77 Level 1 (0 points)
    At least I know it's not just me. I have exactly the same problem and it's driving me nuts. I've tried resetting. I'm sick of taking the cord out. all is well and then for no reason the stupid cpu fan goes nuts. I'm barely using any of the computers ability and even it was under load surely after a few mins it would shut off but it never does...

    < Edited by Host >
  • dre77 Level 1 (0 points)
    who edited my post?
    If your not going to fix my problem please dont delete any options
  • dre77 Level 1 (0 points)
    ok so now the reset doesn't even stop the fans.

    i think its time to return this lemon to apple.
  • Perry Gershon Level 1 (55 points)
    Just looked now and two fans are running over 4000 RPM. CPU and Optical Drive. No idea why Optical Drive fan should be on - have not used drive in many days.

    Note: Now Optical Fan went off. Noise still continues from CPU fan. I have done nothing on this iMac since rebooting 7 hours ago except surf internet with Safari

    Message was edited by: Perry Gershon
  • Perry Gershon Level 1 (55 points)
    CPU fan runs at 4000. Almost impossible for me to get it to slow down. Reset SMC several times. Any ideas anybody?
  • Perry Gershon Level 1 (55 points)
    Finally ran hardware test

    Error 4SNS/1/C0000008:TS2p--124

    Will follow-up with Apple

    Message was edited by: Perry Gershon
  • Perry Gershon Level 1 (55 points)
    Temperature sensor error. New logic board being installed.
  • utat Level 1 (0 points)
    did apple cover logic board?
    i have same issue, and mine is only few weeks old..
    i tried smc and didnt work as well..

    do you have any solution?
  • Perry Gershon Level 1 (55 points)
    New logic board install - 100% at Apple's expense. Took about a week. Works fine now
  • Florez Level 1 (0 points)
    I have the same issue. I've been putting it to sleep to get it to stop and then it is completely silent (cannot hear any fans running at all, which makes me nervous and happy at the same time). How do I run a hardware test so I can see if my issue renders an error message? (sorry, I'm still a bit of a n00b)
  • Perry Gershon Level 1 (55 points)
    If you have a new iMac, there is a way to start it up in hardware diagnostic mode. Older machines require you to have the install DVD. Either way, you want to run Apple Hardware Test and it should tell you if you have a problem.
  • Scanthebarcode Level 1 (0 points)
    Thank you ! Mr.Gershon

    Print out your discussion with the fan problem. Went to the apple store and show then the printout
    showing the exact problem i was having and your solution. They then remedy it the exact same way
    mention in your discussion.

    The first time i went, before finding your discussion, they were saying that the fan noise is normal.
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