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  1. #1

    sonique128's Avatar
    Member Since
    Dec 12, 2007
    Location
    Westminster, CA
    Posts
    4
    Specs:
    24" Intel iMac
    Correlation between faster HDD rpm speeds + loud fan noise?
    I have an Aluminum Intel 24" 2.4ghz iMac which was purchased a little more than a year ago.

    This week the hard drive that came with the computer went six feet under and so I replaced it with a newer one. Since my 1 year warranty was over (a week ago), I replaced the hard drive myself.

    After hooking everything up, it boots up with the "macintosh" noise fine, then the fan kicks in and stays on and fairly loud (~3300rpm all the time). All the internal temperatures are fine too. This annoys me, so I switch back to the old hard drive (which still can be booted up), and the fan stays completely silent like it always was.

    Now, is there something that I did wrong with my swap? Or is my new hard drive with a faster, I think, RPM (Seagate 750gig 7200rpm) causing this? Any help would be awesome. I've tried resetting the SMU many times, and that has not worked. Thanks guys

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,504
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    The system may be indexing the new hard drive. If so, the fan noise should settle down after awhile once everything has been indexed. Give it a few days before doing anything else. If the fan noise continues after that, you can always return the drive for a refund.

    Regards.

  3. #3

    sonique128's Avatar
    Member Since
    Dec 12, 2007
    Location
    Westminster, CA
    Posts
    4
    Specs:
    24" Intel iMac
    It's continuing onto day 2 now. Is that still normal? I know you said a few days...

    Thanks for any help though!

  4. #4

    sonique128's Avatar
    Member Since
    Dec 12, 2007
    Location
    Westminster, CA
    Posts
    4
    Specs:
    24" Intel iMac
    While searching around, I found a thread where someone installed a harddrive wrong which caused the loud fan

    Apple - Support - Discussions - Noisy Fan ...

    What could I have done wrong to make it do that? The HD install seemed pretty straight forward...

  5. #5

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,504
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    After reading the thread you provided it seems there are several things which could impact on the fan speed. Go back over the replacement process and make sure everything is where it's supposed to be. For example: Did you accidently dislodge a thermal sensor? Sometimes it's easy to miss a small sensor or cable that was attached to the original drive.

    An iMac is a compact machine - it's really a large notebook computer on its side.

    Regards.

  6. #6

    Chilbear's Avatar
    Member Since
    Jun 14, 2007
    Location
    Toronto
    Posts
    574
    Specs:
    2xiMac24 w Parallels 6 (1x White, 1x Aluminum), iPhone 3GS with iOS5
    After reading the document, have you tried the simple thing - shut it off and wait for 30 seconds. Sometimes a startup versus a restart can repair things. I leave my iMac on 24/7 but log out every day AND I have mine plugged into a battery backup because of local power issues.

  7. #7

    sonique128's Avatar
    Member Since
    Dec 12, 2007
    Location
    Westminster, CA
    Posts
    4
    Specs:
    24" Intel iMac
    AMFITEATAR - Naucni portal - Upgrade your iMac 20" or iMac 24" aluminum 2007 & 2008 to 1.5TB Hard Drive and 4 GB RAM - DIY Guide

    That's the guide that I've reference for the hard drive switch. Where would all the thermal sensors be? I want to double check.

  8. #8

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,504
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Step 5 of the DIY instruction you followed clearly shows the removal of a temperature sensor from the drive and warns not to bend its pins. It also states the sensor looks like a transistor. It doesn't mention any other sensors regarding the drive so apparently there is only one.

    Go back over the DIY even if you have to once more disassemble your iMac and make sure everything is where it's supposed to be, especially that temperature sensor for the drive.

    Regards.

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