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Fan starts running at 3600RPM with 44 ºC

5654 Views 60 Replies Latest reply: Jan 5, 2014 3:36 AM by mkirke RSS
  • LostAccount Level 1 Level 1 (80 points)
    Currently Being Moderated
    Jul 3, 2012 3:29 AM (in response to René Bijloo)

    If the fans kick in almost immediately after being turned on (after the startup chime) and it's been off all night, and you have done an SMC reset, several times as one recommended, then it should be evaluated by an AASP.

     

    The symptoms as they are don't require the Apple Hardware Test.

  • LexSchellings Level 5 Level 5 (5,485 points)
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    Jul 3, 2012 3:30 AM (in response to René Bijloo)

    Clamxav scan not necessary: virus will be harmless in OSX, but there is is nothing against such a scan either. Do not send the emails with the virus to a windows computer !

    The temp values you gave are all very OK, the RPMs also. EXCEPT for the GPU diode: this is the Graphics Card diode and normally is the hottest of all. Either the sensor is dead or the firmware needs a (SMC) reset.

    If the SMC resets do not solve this, do a Pram reset, although this will not solve the problem I guess, but it does not harm either.

    If this does not help, the system has to be repaired.

  • LostAccount Level 1 Level 1 (80 points)
    Currently Being Moderated
    Jul 3, 2012 3:47 AM (in response to LexSchellings)

    PRAM resets have no influence on fan or sensor issues, as per http://support.apple.com/kb/HT1379, PRAM assumes the following content. On the other hand the SMC reset as per http://support.apple.com/kb/HT3964, can account for, the computer's fans running at high speed even though the computer is not experiencing heavy usage and is properly ventilated.

     

    Contents of PRAM

    • Status of AppleTalk
    • Serial Port Configuration and Port definition
    • Alarm clock setting
    • Application font
    • Serial printer location
    • Autokey rate
    • Autokey delay
    • Speaker volume
    • Attention (beep) sound
    • Double-click time
    • Caret blink time (insertion point rate)
    • Mouse scaling (mouse speed)
    • Startup disk
    • Menu blink count
    • Monitor depth
    • 32-bit addressing
    • Virtual memory
    • RAM disk
    • Disk cache

     

    Seeing that I am in the middle of correcting someone, I should be fair and correct myself. In an earlier post I recommended removing the com.apple.PowerManagement.plist file for this issue. I don't believe I read the original poster's original question correctly or something but of course it has no influence on fans as they are the exclusive domain of the SMC and the only a firmware update can alter the SMC and its functions.

     

    The contents of this file (com.apple.PowerManagement.plst) vary on the type of mac and how your system preferences are set but here is a screenshot of mine.

     

    Screen Shot 2012-07-03 at 12.43.58 PM.png

  • WZZZ Level 6 Level 6 (11,875 points)
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    Jul 3, 2012 3:44 AM (in response to René Bijloo)

    As Lex said, ClamX is not necessary. But also no harm. This behavior does not indicate in any way that your computer has been infected by malware of any kind.

     

    If you'd like to have a better understanding of malware for Macs, this is a good introduction to the subject.

     

    http://www.reedcorner.net/mmg/

     

     

    What are the results of running the hardware test?

  • LostAccount Level 1 Level 1 (80 points)
    Currently Being Moderated
    Jul 3, 2012 3:55 AM (in response to WZZZ)

    I think at this time little more can be done.

     

    1) SMC resets have not remedied the issue.

    2) The machine was left off overnight but after the startup chime the fans started to run at full speed.

     

    The mac should be evlauated by an AASP. The significance of the AHT results are not necessary as the symptoms speak for themselves. The AHT results, if positive would be of value only to a certified technician, it would let him/her know which component is reporting issues.

  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Jul 3, 2012 4:17 AM (in response to LostAccount)

    The AHT results, if positive would be of value only to a certified technician, it would let him/her know which component is reporting issues.

    Perhaps, if you don't mind, you'll allow the OP to decide to reply to my question? You are adding nothing to the discussion, except what's already obvious. You are not talking to a bunch of dummies or slouches here.

  • LostAccount Level 1 Level 1 (80 points)
    Currently Being Moderated
    Jul 3, 2012 4:25 AM (in response to WZZZ)

    You have aggressively attempted to ruin my reputation on this thread twice now.

     

    Please consider the following:

    Be Polite

    Post constructive comments

    Don't be defamatory

     

    If you fail to abide by these terms I will consider contacting Apple to report the submission(s) you posted here.

     

    Kindly govern yourself on this forum.

  • LexSchellings Level 5 Level 5 (5,485 points)
    Currently Being Moderated
    Jul 3, 2012 4:41 AM (in response to LostAccount)

    I am polite, but I agree with WZZZ that your posts do not add anything to the discussion. Please do not ruin your reputation.

  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Jul 3, 2012 5:16 AM (in response to LostAccount)

    I have been consistently polite. My comments, first and foremost, have been composed with the OP in mind (I would remind you that is who really matters in this thread), and intended to correct any misinformation, from wherever it might appear. In that light, they have been entirely "constructive." If you feel your "reputation," which in no way have I been "attempting to ruin," suffers as a result, then perhaps you need to consider your replies more carefully before submitting them.

  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Jul 3, 2012 6:17 AM (in response to René Bijloo)

    Do you have the original DVDs that came with the Mac?

  • LostAccount Level 1 Level 1 (80 points)
    Currently Being Moderated
    Jul 3, 2012 6:34 AM (in response to René Bijloo)

    Hi René

     

    I apologize that there was little more any of us could do to help you out. The only thing you can really do is ensure with absolute clarity that you have indeed followed Apple's steps on resetting the SMC. As you may have already noticed, this article http://support.apple.com/kb/HT3964 outlines the steps but they differ depending on your model.

     

    I hope that it is simply a sensor that has gone the wayside and it's not the SMC itself or it could be the MLB that needs replacing.

     

    At one stage you pondered whether you should get a new mac or fix this one. If the cost of repair equates a new logic board, which is rather expensive you may want to consider your options and consider a new mac. It's a decision only you can make.

     

    I really am sorry but hope that an AASP will be able to resolve the issue at a reasonable cost.

     

    On your visit to an AASP, I recommend they document the cosmetic condition of your mac on paper so that you have recourse with them or Apple (as an AASP is an Apple partner) should your mac come back damaged in any way that is cosmetic.

     

    I wish you all the best.

     

    PS remember to backup your data before dropping off your mac at the AASP - just in case.

     

    I thought I would do one more search and came across this article, http://support.apple.com/kb/TS3334. I am not sure if this is your mac though. This might just be of little value now, http://support.apple.com/kb/ht4543 (Learn about the fans in your Mac)

     

    I wanted to make one other point about the AHT. In the past, when macs shipped with their own install DVD, unlike today where it's preinstalled with Lion and no discs are included, the discs would include a version of AHT that was specific to that model. In other words, the discs that shipped with your mac would be the AHT you would need to run. The disc has AHT and its version labelled on it, maybe this is why command-D did not work for you?

     

    These are some articles that are relevant on the matter:

    http://support.apple.com/kb/PH4510 OS X Lion: Use Apple Hardware Test

    http://support.apple.com/kb/HT1883 Apple Hardware Test: iMac (Mid 2007) and later models

    http://support.apple.com/kb/ht1509 Intel-based Macs: Using Apple Hardware Test

    http://support.apple.com/kb/TS4154 About the "Apple Hardware Test does not support this machine" message

     


    Take care…

  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Jul 3, 2012 6:24 AM (in response to René Bijloo)

    If it's the original  DVD. It needs to be the machine specific install disc that came with the Mac.

     

    To run Apple Hardware Test from the Install DVD

    1. Insert the 'iMac OS X Install Disc 1' install DVD into the optical drive of your computer.
    2. Restart the computer while pressing and holding the 'D' key on the keyboard during startup.

    Note: You can restore Apple Hardware Test to the internal hard drive using the 'iMac OS X Install Disc 1' install DVD that came with your iMac (Mid 2007) or later. To do this, use the Restore feature to reinstall your System Software.

    http://support.apple.com/kb/HT1883

     

    To use that list, check for your model number from System Profiler from the  Menu>About this Mac>More Info.

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