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Overheating iMac

I'm having a major issue with my 6 y/o iMac. It gets very hot (especially toward the top), slows way down, "lollipops" and eventually freezes up. Any idea what could be the cause of this or is this normal?


Also, usually when I force it to shut-down (unplugging), it sometimes has a problem finding the System Folder when starting back up.


Any help would be very appreciated.

Posted on Jun 26, 2013 10:55 PM

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Posted on Jun 26, 2013 11:23 PM

Run Apple Hardware Test in extended mode 2-3 times and look for error codes.If any appear than indicates it's time to take it in for service. You should probably download iStatPro to get actual temps, then we can tell whether its running too hot or not.

40 replies

Jul 24, 2013 2:17 PM in response to MichelPM

If your iMac is not seeing the system folder when booting up there is two things you can do.

Once booted up, in OS X System Prefernces Pane in the OS X Dock, look for and click on the Startup disk icon.

Your main OS X system should show up in a horizontal window. Clicl this System disc icon once, than at the bottom of the window click on the lock symbol.

Either restart or completely shutdown your iMac as see if it boots to your hard drive much quicker.


If this still doesn't work. hold down the iMac's ppower button for 10 seconds to force power down your iMac.

Wait another 10 seconds then press the power button as normal and immediately hold down the Option key on your keyboard to try and invoke the OS X Startup manager. If your hard drive appears on screen, pick this drive for startup.

Jul 24, 2013 3:54 PM in response to Cameron Perry

Cameron,

I think there is a section in Photoshop's Prefernces to limit the amount of available RAM you can allow PS to use.

Just in case PS is just eating up all of your available RAM while you are working.

The lollipopping could be the result of PS just grabbing all of your available RAM and not leaving enough for the system to operate.

You might want to look into that.

Jul 24, 2013 4:31 PM in response to Cameron Perry

With 15k worth of emails, this maybe THE big issue with Mail.

I thin out my Mail app constantly to keep from letting it get out of hand.


As to your startup issues, other things that might work or help


You could try resetting the NVRAM.

Resetting NVRAM / PRAM

  1. Shut down your Mac.
  2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.

If this doesn't help, you could try a reset of the SMC (System Management Controller).

  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.

Overheating iMac

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