HT201581: Find your Mac's serial number in About This Mac or System Information

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Tara Sumant

Level 1 (0 points)

Q: fan making a loud noise on my iMac running OSX Lion 10.7.4

Has anybody had this problem. The cooling fan on my 27 inch iMac has suddenly gone into high speed.

iMac, Mac OS X (10.7.2), lion os

Posted on Aug 1, 2012 7:36 PM

I have this question too

Q: fan making a loud noise on my iMac running OSX Lion 10.7.4

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Helpful answers

by John Galt,

John Galt Aug 1, 2012 7:45 PM in response to Tara Sumant
Level 9 (50,379 points)

Mac OS X

Aug 1, 2012 7:45 PM in response to Tara Sumant
Problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset:

Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve

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