24" iMac 2.4GHz Fan Speed

Hi,
I recently purchased a 24" Intel iMac 2.4GHz. Forunately I haven't experienced any crashing or freezing problems like some users have, but what I have noticed is that the fan(s) seem to speed up quite significantly for no apparent reason when the machine is idle.
When the computer is doing absolutely nothing sitting at 32 degrees, the fans speed increases from around 1200rpm up to about 3300rpm.
Can anybody tell me if this is normal for the 24" iMacs? I used to own a previous revision 20" iMac and I hardly ever heard the fans kick in. It wouldn't normally bother me, but the fact that it makes a lot of noise is kind of annoying.
I have updated to 1.1 with no joy. Currently I am using iStat Pro via Dashboard to read my system performace.
Thanks,

Elusive,
Any luck finding an answer? I have a similar problem.
My Hard Drive fan is running 5000-5500rpm all the time.
I've followed the instructions for resetting the SMC:
http://docs.info.apple.com/article.html?artnum=303446
But this did not help. It seemed to get progressively worse. At first going full speed only occasionally, then after around an hour of use, then less. As of tonight it comes on when I turn on the machine (after being unplugged for several minutes) and stays on at the >5000rpm speeds.
If you find a solution, let us know.
Thanks,
jp
My setup:
- 24" iMac 2.4GHz Intel (new/aluminum)
- checking stats with iStat Pro widet
My Fans
- Optical Drive: 698rpm
- CPU fan: 1200rpm
- Hard Drive Fan: 5492rpm

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David,
Looking through my old posts to refresh my memory, my face is red as *I AM* mistaken:O
http://discussions.apple.com/thread.jspa?messageID=4064287&#4064287
I was recalling that Intel iMac users were doing the wrong SMC result three years ago (actually they were doing the SMU reset that was for the pre-Intel G-5 iMacs), and that you and I explained to them the correct way - which is of course what you recommended above:D
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Message was edited by: myhighway

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Message was edited by: BGmail

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Hi, just opened my shiny new imac but the fan runs all the time and very loud! Has anyone any ideas how to fix this or should I return the imac to apple?
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Try an SMC reset, you may need to do it at least 2x.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Wait 15 seconds.
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Wait another 5 seconds and press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
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Hold the keys down until the computer restarts and you hear the startup sound for the second time.
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I think you have to balance the need to run cooler against running the fans so fast you wear out the motors quickly. In general, it's probably best, at least for prolonged periods, not to run them any higher than maybe ~400 rpms above the defaults. But that's just my own guess. I don't have any statistics on what fan speeds are ideal for attaining that balance.
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Hi guys , im a new mac user and i was wondering i downloaded istat pro
and i noticed a low humming noise when running so i lookd at the fan speed and
the
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an i just use it for webbrowsing and music and downloading like the only third party software i own is utorrent and handbrake..
i posted my computer stats below
are Overview:
Model Name: iMac
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Processor Name: Intel Core 2 Duo
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Total Number Of Cores: 2
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Chipset Model: ATI Radeon HD 4850
Type: Display
Bus: PCIe
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Those look like normal fan speeds for the latest Macs. But you can use software that allows you to create different speed sets for different circumstances.
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3) Removed the back and blew dust from fans, ports, etc.
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iMac G5 (ALS) 17" 2.0GHz 512MB RAM Superdrive Mac OS X (10.4.8)
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Just an FYI. During my iMacs motherboard replacements (3) I was never asked for a case number once. I spent hours on the phone with Applecare when in reality I already new I had a hardware problem and if I would have just taken it in it would have been fixed quicker. The third time I took my iMac G5 in for service the local tech told me to call up Applecare (3rd time then call) and ask for a replacement stating that if they need to call me he would explain that I had a lemon. In everyone of the three bad motherboards the fans spun out of control so I have more experience than I would prefer on this subject. They did step up and as you can see in my profile I have a new Intel iMac courtesy of Apple.
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HD fan (desired) 2100 RPM / (current) 2099 RPM
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Internal HD: 108°F
Internal DVD: 95°F
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Your welcome and no problem. I would say only the Apple engineers can tell you why the fans are set to those speeds however my best guess is the obvious they found those speeds the closest to keeping the temps at an optimum operating temperature. I found when I'm doing graphics intensive work my machine heats up but quickly cools down when I'm done.

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Hi Jossmac
Reset your iMac's SMC exactly as described in the Apple Support article below:
http://support.apple.com/kb/HT1543
The last G-5 iMac's were built in 2005 and the 2006-2008 model's are Intel iMac's, to prevent confusion please correct your profile to read "Intel iMac 2.4GHz Core 2 Duo" or something like that!
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Hi,
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Oh it's fine! I kind of wasn't extremely helpful because I have seen a lot of previous posts with not much results (they were a few years old though). Yea the only reason I do use windows is because of .Net framework development :\. I would like to switch to all java but I like XNA and Visual Studio. Mono ***** so I'm just waiting for something good. Anyways thanks for the help. And if any low level mac programmer see's this, please tell me how you could go about this!
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24" iMac 2.4GHz Fan Speed

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