FAN IS INCREDIBLY LOUD

Question

Level 2

170 points

FAN IS INCREDIBLY LOUD

My six month old imac suddenly has a very very loud fan blowing when I turn it on. I assume that is not a good thing. any ideas? It's still under warranty thank God.

imac, Mac OS X (10.4.2)

Posted on Jan 26, 2011 2:50 PM

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Answer 1

MGW

Level 7

27,041 points

Jan 26, 2011 3:09 PM in response to JoanneD

You have an intel, I'll ask that you post be moved to the proper forum. Since you are still covered by warranty, you should contact Apple and have a Genius look at it. You probably have a faulty power supply unit or a bad fan.

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Answer 2

captfred

Level 7

26,422 points

Jan 26, 2011 3:16 PM in response to JoanneD

Joanne,

If the power button was being held down when the system was plugged in (or other means to power the cord) then it goes into a special mode that fans run full blast. You need to reset the SMC to fix.

Regards

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Answer 3

rkaufmann87

Level 10

140,532 points

Jan 26, 2011 3:25 PM in response to JoanneD

As captfred mentioned you need to do a SMC reset. Here are instructions:

*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.

*PRAM RESET*

• Shut down the computer.
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
• Hold the keys down until the computer restarts and you hear the startup sound for the second time.

Roger

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Answer 4

JoanneD Author

Level 2

170 points

Jan 26, 2011 3:26 PM in response to rkaufmann87

You read my mind! I needed instructions. Believe it or not I work in IT support on pcs and while I only use Macs at home, my knowledge of fixing them has diminished once I started working strictly on pcs.

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Answer 5

captfred

Level 7

26,422 points

Jan 26, 2011 3:30 PM in response to rkaufmann87

Thanks Roger,

I couldn't find the instructions. Although I should have considering I've asked you for them before.... 😉

Captfred

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Answer 6

rkaufmann87

Level 10

140,532 points

Jan 26, 2011 3:36 PM in response to captfred

No problem for future reference bookmark: http://support.apple.com/kb/HT3964

🙂

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Answer 7

rkaufmann87

Level 10

140,532 points

Jan 26, 2011 3:37 PM in response to JoanneD

Your welcome, I'm pretty sure this will take care of the problem.

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Answer 8

JoanneD Author

Level 2

170 points

Jan 29, 2011 3:32 PM in response to rkaufmann87

Worked like a charm! took seconds to fix. Thanks.

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Answer 9

rkaufmann87

Level 10

140,532 points

Jan 29, 2011 4:26 PM in response to JoanneD

Your welcome.

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Answer 10

mfonseca

Level 1

8 points

Mar 3, 2011 7:24 PM in response to rkaufmann87

Hello. I'm having the same problem in a brand new iMac (i bought it 2/27/2011). Fan is incredibly loud and running at full speed after I turn on computer. I've tried to solve it reseting SMC but didn't work. Any idea on how to fix it? thanks

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