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Overheating Troubleshooting for 21.5 iMac (mid ...

I have been having issues lately with my 21.5" iMac (mid 2011).  It was purchased in June 2011 and is currently running the latest version of OS X.

This issue I am having is that once the computer has been is use for a few minutes (usually around 5-10...depending on usage type), the computer will freeze up and make clicking noises and is very warm to the touch.  Specifically, I will be unable to do anything and the cursor will pinwheel.  I can usually move the cursor around, but cannot click anything.  During the "freeze", there are clicking noises.  The clicking is in groups of twos....like Click...Click.....pause for a few seconds, Click.....Click, etc....  The noise sounds like it is coming from around the center bottom of the computer...maybe near or around where the base connects.  It sounds like it may be a drive starting and stopping, or a fan stopping and starting....I don't know?....it's a mechanical type clicking it seems.   It will freeze for extended periods of time (minutes) then you can usually do something else, but it will just happen again.  Sometimes, you have to shut the computer down and when you do it takes forever to boot back up.

Any ideas on what may be causing this or what I can do to troubleshoot the cause?  I'm too far away from an Apple Store to just casually take it in to have it looked at.

Thanks.

The first thing to do is backup your hard drive.  It sounds as if the hard drive is beginning to fail.  After that Boot into the Recovery volume (boot with the Command + R keys held down), select Disk Utility and repair the disk and disk permissions. Also check the Smart Status of the drive in Disk Utility.

Reboot normally and see if there's any improvement.

Thanks!  I have it backed up to my Time Capsule (confirmed recent backup as well).  I'll follow those other instructions when I get home and report my findings.  Is replacing a HD in this iMac something the user can do?  If so, then just restore from my Time Capsule backup?

Is replacing a HD in this iMac something the user can do?

Not easily.  There are tutorials for that however: iMac Intel 21.5" EMC 2308 Hard Drive Replacement - iFixit. It's not for the feint of heart.

You'll have to read up on it and see if you want to take on the task.  A good source for replacement drives are otherworldcomputing.com and crucial.com.

But confirm that it is a bad drive before replacing. You can try the Apple Hardware Test: Using Apple Hardware Test

Apple hardware test doesn't really help hard drives though... I had a macbook that I put on its side and had the hard drive running... Hardware test didn't show a thing. Single-User Mode gave me an I/O error. I would boot in single-user mode for second and see if an error during the boot. After that just type in exit and you will reboot normally

Go to > https://www.apple.com/support/imac-harddrive/ and see if your iMac qualifies.

It sounds very likely that the hard drive will require replacement. If you're not comfortable doing the removal and replacement, you'll just have to take it to an Apple authorized service provider to have the drive replaced.

As noted in the tutorial link Old Toad provided, OEM Apple hard drives for the iMac have an internal temperature sensor that is not present in non-OEM Apple models. If you use a non-OEM Apple drive, with the original Apple cable, it's very likely the fans will run at high speed 6000 rpm once the system warms up after power-on.

Replacing a mid-2011 iMac hard drive even WITH a proper sensor cable still requires a few tools and some significant disassembly, including the removal and temporary storage of the LED screen in a relatively dust-free environment, and disconnecting a number of cables in order to replace the drive before subsequent re-assembly.

Other World Computing (www.macsales.com) offers (both hard drives and) a hard drive cable with a thermal sensor that mimics the function of the sensor present in the OEM Apple hard drives. OWC updated both the cable and their original YouTube video for mid-2011 iMac 21.5" hard drive replacement in March 2014: https://www.youtube.com/watch?v=rLuk_8w7KwU

The OWC replacement cable allows you to select most any 3.5" hard drive and still have proper 'factory' fan operation, so the fans aren't racing at full speed all the time.

The full OWC toolkit complete with sensor cable is here: https://eshop.macsales.com/item/OWC/DIYIMACHDD11/

The OWC sensor cable only is here: https://eshop.macsales.com/item/OWC/DIDIMACHDD11/

Then you still need to select and purchase a 3.5" internal hard drive.

I've used OWC for a number of upgrades to the three Macs in our family: mid-2007 MacBook, mid-2009 Unibody MacBook Pro, and mid-2011 iMac. I'm planning to do a hard-drive upgrade to my mid-2011 iMac using the OWC cable, once the AppleCare warranty expires.

I am having an overheating issue with this model of iMac12,1.  I've done everything to check the hard drive, it is verified. I can't even hear a fan...could it be that quiet? Could the fan be not functioning to cause overheating or is it the hard drive? The hard drive reached temp of 132F - not good. THANK YOU for your reply.

Sunny Wood

Macs 'n More

Desert Hot Springs, CA

sunnywood@me.com

www.macsnmore.com

最后更新：2017-10-14 03:07:57

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