Previous 1 2 Next 15 Replies Latest reply: Jul 17, 2013 9:33 AM by Robert DiIorio
danielfrombanks Level 1 Level 1 (0 points)

My iMac just got its hard drive replaced the other day a since then the fans have been very loud, this has never happened before. what can i do?


iMac, Mac OS X (10.7.2)
  • rkaufmann87 Level 9 Level 9 (50,745 points)

    Do a SMC reset. Here are the instructions, if they don't work the first time then do it again. If this still doesn't   work then the work wasn't done correctly and needs to be returned to the repair shop.

     

    SMC RESET

     

    • Shut down the computer.
    • Unplug the computer's power cord and all peripherals.
    • Press and hold the power button for 5 seconds.
    • Release the power button.
    • Attach the computers power cable.
    • Press the power button to turn on the computer.
  • cylon7 Level 1 Level 1 (0 points)

    rkaufmann87 gave you the SMC reset procedure for a laptop (without a removable battery).

     

    For your iMac, the procedure is different.

     

    http://support.apple.com/kb/ht3964

     

    Then about halfway down the page, it says, "Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve". Here's that procedure verbatim:

     

    1. Shut down the computer.
    2. Unplug the computer's power cord.
    3. Wait fifteen seconds.
    4. Attach the computer's power cord.
    5. Wait five seconds, then press the power button to turn on the computer.

    Note that you want to unplug the power cable from the back of the computer - just unplugging it from the wall won't have the same effect.

     

    You might also want to try a PRAM reset at the same time, it won't hurt and it might help.

     

    http://support.apple.com/kb/ht1379

  • rkaufmann87 Level 9 Level 9 (50,745 points)

    No I did not give directions for a laptop. The directions are correct and should be followed. If you would like to see directions for a laptop they are:

     

    SMC RESET

     

    • Shut down the computer.
    • Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
    • On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
    • Release all the keys and the power button at the same time.
    • Press the power button to turn on the computer.

     

    Please note the directions are dramatically different than what I posted originally!

  • cylon7 Level 1 Level 1 (0 points)

    I posted the link to the official Apple article. Your procedure will not work on an Imac. Read the article.

  • rkaufmann87 Level 9 Level 9 (50,745 points)

    cylon7 wrote:

     

    I posted the link to the official Apple article. Your procedure will not work on an Imac. Read the article.

    Sorry you are wrong on this one, I have been posting those instructions for several years now and have probably well over a hundred users that have used them to solve their fan (and other) problems.

  • pianoman1976 Level 1 Level 1 (100 points)

    Maybe it's possible that both methods work.  What I wanted to add is that the fan will possibly still continue to sound like a lawnmower after SMC reset.  An additional restart seems to silence it back to normal functioning. 

  • rkaufmann87 Level 9 Level 9 (50,745 points)

    pianoman1976 wrote:

     

    Maybe it's possible that both methods work.  What I wanted to add is that the fan will possibly still continue to sound like a lawnmower after SMC reset.  An additional restart seems to silence it back to normal functioning. 

    Sometimes it takes a second reset to be done, this is fairly common and why I suggest doing the reset 2x. The reason I advise users to unplug all their peripherals is because sometimes peripherals (USB, FW & FW 800 devices) are the cause. Just something I have picked up from experience over the years and why I suggest disconnecting them as part of the reset procedure.

  • cylon7 Level 1 Level 1 (0 points)

    Apple engineers say, that to reset SMC, you follow the procedure outlined in KBase Article HT1379.

     

    How much you've posted to the forums is irrelevant rkaufmann87. You're not one of the engineers who created the product.  The engineers who created the product, say to follow the steps outlined in that article HT1379.

     

    The procedure you listed is incorrect and will not work to reset SMC on an iMac. Read the article. It's there in black and white, with very clear steps. As the article states, you have to unplug the power cable from the back of the machine, wait 15 seconds, plug it back in, then wait 5 seconds before turning it on. The article says nothing about holding the power button for 5 seconds.

     

    People come in here, for computer science advice. I cited my source, for this scientific procedure. My source, is an article from the computer scientists who created the iMac product. I'm also an Apple certified repair technician - so I listen to what the Apple engineers say.

     

    Can you cite your *official* source for your incorrect procedure? Didn't think so.

  • cylon7 Level 1 Level 1 (0 points)

    Plus, the SMC reset procedure you listed for a laptop, only works on a laptop that doesn't have a removable battery. The procedure on a laptop with a removable battery is different. This is also outlined in the article.

  • pianoman1976 Level 1 Level 1 (100 points)

    cylon7 wrote:

     

    Apple engineers say, that to reset SMC, you follow the procedure outlined in KBase Article HT1379.

     

     

    Wrong article.  You mean:

     

    http://support.apple.com/kb/ht3964

     

    The reason why rkaufmann's method works is because while the procedure is slightly different, his steps are enough to trigger the SMC reset.  You're really only talking about a matter of seconds difference between the two procedures. Chances are your power cable will be unplugged for at least 15 seconds which really is the only requirement.  The final 5 second wait on the official instructions have nothing to do with the SMC reset rather this is how long the iMac takes to recognize the power before it can be turned on.

     

     

  • cylon7 Level 1 Level 1 (0 points)

    Actually you're right pianoman1976, it's article http://support.apple.com/kb/ht3964. I copied the wrong link from above. HT1379 is the PRAM reset article.

     

    I'm still going to listen to Apple engineers, over forum posters. They literally 'wrote the book' on the subject.

  • cylon7 Level 1 Level 1 (0 points)

    Also with you saying "his steps are enough to trigger the SMC reset" - they're still not the right steps. There's no need to press the power button for 5 seconds. And leaving it unplugged for only 5 seconds, is not enough time. Unplugging the machine, then wrapping yourself in aluminum foil and standing on one leg, before you plug the machine back in, would also be enough to trigger the SMC reset.

  • pianoman1976 Level 1 Level 1 (100 points)

    You're suppose to waive a salami over it after the tin foil step. 

     

    I think what you're after here cylon is some validation.  You appear to be pretty tangled up in this.  Yes, you are correct.  In fact, that was quite clear already - no need for the additional posts. 

     

    Thank you for this clarification.

     

     

  • GSmygle Level 1 Level 1 (0 points)

    This procedure works.  I just tried it and the fans slowed down.

     

    Thank you cylon7.

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