Macworld: New iMac loud fan noise ...

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8 Replies Last post: Jan 9, 2008 7:40 PM by MacCheetah3

lanceh5

30 posts since
Nov 4, 2004

Oct 15, 2007 12:10 PM

New iMac loud fan noise

The new iMac, 2.4Ghz, now has the fan running a high speed. Quite noisy. Today is the first time the fan came on. The iMac is one month old. I repaired permissions and rebooted several times but the fan is still on. The room temperature is 65 so that is not the issue. I shut down the computer at night and startup in the morning.

I am running the hardware test now, unplugged every thing except the keyboard and mouse and restarted with "D" key pressed down.

Any thoughts??

GCG

260 posts since
Apr 1, 2003

1. Oct 15, 2007 12:19 PM

in response to: lanceh5

Re: New iMac loud fan noise

Hi-

It could be a faulty temperature sensor. Since your iMac is a month old, it's still under warranty, so take it to an Apple Store, or contact Apple Care, and have it checked out. Good luck.

lanceh5

30 posts since
Nov 4, 2004

2. Oct 15, 2007 1:47 PM

in response to: GCG

Re: New iMac loud fan noise

The hardware check was OK. Just got off the phone from Apple help. Removed the power cord from the back of the iMac waited 15 seconds and plugged it back in. Solved the problem! Go figure??

hautster

209 posts since
Aug 25, 2005

3. Oct 15, 2007 3:36 PM

in response to: lanceh5

Re: New iMac loud fan noise

That's good to know. Perhaps there's an automatic power reset on the new iMacs when they're unplugged for a while. That would be nice for those of us who have had to reset the power manager on our machines.

lanceh5

30 posts since
Nov 4, 2004

4. Oct 15, 2007 7:18 PM

in response to: hautster

Re: New iMac loud fan noise

To clarify the obvious, the iMac was shut down all devices were unplugged except the keyboard and
mouse then the power cord was unplugged from the back of the iMac.

What is interesting to me, when the iMac is shut down every evening a power strip is turned off that cuts off power to iMac, printers and external hard drives. So there is no power available every night? But unpluging the cord from the back of the iMac worked??

GCG

260 posts since
Apr 1, 2003

5. Oct 16, 2007 8:49 AM

in response to: lanceh5

Re: New iMac loud fan noise

Glad to hear your fan problem is fixed. It's interesting to hear about some of the high-tech solutions recommended by Apple. Good luck.

MartinChua

2 posts since
Oct 16, 2007

6. Oct 16, 2007 9:27 AM

in response to: GCG

Re: New iMac loud fan noise

hi all, i'm from Singapore and encountered similar problem of LOUD fan noise on my new iMac Intel 20" (less than a month old) 2 weeks ago. It happened when i switched on the Mac, after I came back from work. The fan noise was unbelievably loud (like a vacumn cleaner!) . Under normal circumstances, you can't even hear any fan noises.

From the back of the horizontal vent,i can feel air gushing out ! I tried to off it and restart...no use.

Here's what i did to "solve" . I shut down and went for my dinner.
Half an hour later, I switch the Mac on and the fan noise disappered !

Since then, touch wood...it is okay.

I did nothing different....Strange !!

Hope this help if anyone else encounter this problem.
Switch off and take a break ....an restart...before you drag the whole iMac to service centre.

Cheers
Martin

Marquitofc

1 posts since
Jan 9, 2008

7. Jan 9, 2008 6:08 PM

in response to: MartinChua

Re: New iMac loud fan noise

Hi, my iMac Intel 20" does the same thing. Sometimes, when I turn it on (and don't hold the power button until hear the beep) the fans go crazy!!!! Strangely, this only happens when I don't wait for the beep to release the power button.

And the problem is: when I use BootCamp and the fans are crazy, Windows don't start. MacOS X runs OK (if you can ignore the noise and the "tornado" on the back of monitor..). Go figure....

Anyone has the same Windows problem??? It only crashes at startup when the fans are like that, so i guess it's no a software problem.

MacCheetah3

6,548 posts since
Apr 2, 2001

8. Jan 9, 2008 7:40 PM

in response to: hautster

Re: New iMac loud fan noise

Hi
This should help you understand a bit more. It's also the same process for the Intel based Mac mini, iMac G5s, and Power Mac G5 ( Late 2004 ). Once I started reading your post I realized what Apple was suggesting and why, and remembered that was the new way of a PMU like reset and that's what I had to do to my iMac G5 ( iSight ) once.

Apple MacBook (Black) 2.16GHz C2D, 2GB, 160GB (5.4K), DL-SD + 16GB iPod touch ? Debug Computer Services http://www.click2debug.com

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Oct 15, 2007 12:10 PM

New iMac loud fan noise

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