IMac 27'' fan never below 1700rpm

Hello - I have a new 2014 iMac 27'' i7@4GHz but the problem is that - no matter what the temperature of the computer is - the fan never goes below 1700rpm (which is very loud compared to my old one) - not even in idle mood. Right now e.g. the tool smcFanControl shows 95 Fahrenheit and 1700rpm - there is no need for such a high fan speed. I reset SMC a couple of times (unplug power for 15 sec then restart) and also reset PRAM (cmd+opt+P+R until the second sound) but noting worked. Any idea...?

You should not attempt to modify the fan speed of your computer. Apple's machines are finely calibrated. If you have a reason to believe the machine is failing to offer the right amount of speed, take it to Apple or an authorized repair shop for diagnosis. There are many reasons for slow down if that's the reason you were diagnosing in the first place, which my subscription FAQ covers*:
http://www.macmaps.com/Macosxspeed.html
Otherwise, don't give yourself more reason for headaches. And keep your data backed up.
* Links to my pages may give me compensation.

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HT4543 What to do if the fan never comes on...even when the IMAC is very hot?

I've had my IMAC for 2 months. I was using the computer for an extended period today whikle playionmg a game. Game play seemed after a while but I concluded it was due to a lot of info being "worked". Anyway, the computer was very hot after a few hours of playing. I became concerned 'cause the fans never came on. Is this typical, or should i have heard them earlier? Also, is there a manula way to engage the fans? Thanks

Just to be sure do a smc reset.
But also install any one of the temperature monitors like iSTAT Pro, iSTAT Menus, Temperature Monitor, Hardware Monitor, etc.
And if you are really concerned that the fans you can override the built in settings by using smcFanControl.

After mavericks upgrade fans never go off

Over the last few days, I began to notice that the fans on my early 2009 imac never go off, (didnt notice at first because I usually run the TV in the background)
Installed temp monitoring software, but did not really find an answer that was obvious.
Purchased new, used in a non smoking enviroment in a cold room.
Noticed two things, one is the fans never came on much because the average temp in the room is 68 amb temp.
If I run a high CPU prog or FSP, Abobe, ect, the fans come on for a bit then gradully ease off.
This I considered normal, however over time, I noticed that the fans were staying on longer.
Now they never go off, even when placed in sleep mode, until upgrading to mavericks, the fans remain on even when in sleep mode.
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Any ideas thoughts ect, thanks.

Tried that previously, also reset pram nvram, tried it again, (just in case) but no change in fan always on condition, (I guess its better than a melt down) just wondering if something is about to pop, would rather service the unit than loose my data or loose the board.
Oh, also as an interesting comparison, updated my Macbook pro, mid 2010 17 inch, it also has the same condition, fans just run and run, not full speed as some others are reporting, just the lowest speed, default.
But they never go off, even in sleep or when the lid is closed on mac book pro

IMac G5 fan always at maximum speed after booting into si...

IMac G5 fan always at maximum speed after booting into single-user mode in 10.4.3
Model: 1.6GHz iMac G5 with 10.4.3
I updated my iMac to 10.4.3, then booted into single-user mode to do some cleaning at the command-line level. I know, as others have discovered, that in single-user mode, the thermal control is off, so the fan gradually increases up to maximum speed and stays there until you reboot or go into multi-user mode. Well, I have never experienced this one before, and I'm freaking out about it... I went into single-user mood one reboot after upgrading to 10.4.3, and after all the println white text lines ended, the [1] fan shot up to maximum speed in 0.35 seconds (it sounded like a high-pitched DJ record scratch during the time interval), [2] the fan stayed at maximum speed when I left single-user mode, and [3] I cannot get the fan to slow itself! I rebooted, shut down, and even tried booting off the Tiger CD, but the instant I hit the power button to turn on the iMac, the fans blast up to maximum speed. They shut down when I put the iMac to Sleep, but then they blast up again in full when it wakes up. I checked my settings in the Energy Saver preference pane, and I have the performance set to "Reduced," which is the lowest possible.
I searched to see if anyone else had this problem or if the KBase had any info, but I didn't see any. I'm thinking about erasing and installing my stuff on the iMac, even though I just did that today.
Again, this maximum speed fan problem is freaking me out. It just started when I booted into single-user mode in OS X 10.4.3. I have booted into single-user mode before (10.4.2) and have not experienced this fan issue. I repeat, the fans blast up to maximum speed after pressing the power switch to turn on the computer, so they do not even wait for the Apple logo to show up on the screen before blasting away. How can I get these fans to not do this anymore?!

for the last few months my 20" 1.8GHz Imac has been very noisy - fans seem to run constantly and noisily. It might have been when updating to Tiger but I was never sure. Today, on the advice of a chat tech, I opened the case and reset the SMU to hopefully cure another problem. I noticed that all the air vents, intake and expel ones, were all quite heavily clogged up - not blocked but clogged with dust and fluff. I cleared it away mainly by blowing but also with a hand held hoover held close by. The exposed fan still as a lot of muck on it but greatly reduced and all the vents are completely clear. Having put everything back together again the iMac has been runnning quietly all day. May have been the SMU reset but equally might just be that the computer couldn'tdraw in cool air, circulate it or expel it properly and the fans had to work overtime to cope. Worth checking if you have noisy fans running at speed constantly.

Imac high fan speed and goes to sleep 10sec after wake-up

Hi,
Since today my imac's fan speed is high (optical fan and cpu fan speed at: 4000rpm)
Done a hardware test wich gives me 4SNS/1/40000001:IDSR-0.000 indicating something with logic board. According to istat all my temperatures are below 35°C (95°F). istat has readings for the cpu and optical drive temp (both around 26°C)
On top of that if I put my imac to sleep after wakeup (give or take) 10sec later it would go to sleep again. tried the smc reset procedure. no success
Any other tricks to try or just go for an exchange? (imac was bought on 2feb2010)

I've had this problem since replacing the MLB in my iMac a few weeks ago. Initially brought in for repair when the CPU fan came on at 4k rpm and stayed on even after SMC reset and nvram reset. First replacement MLB was a dud, second corrected the fan problems. Now I'm having the sleep issue, I can't tie it to any particular process. Initially I thought it was graphics related as it would go to sleep during graphics intensive work, but yesterday it was doing it when just copying data to an external drive. The temperatures of the CPU and the GPU diode are within spec. I now use a fan controller to keep the CPU fan at 2100rpm and the HD fan at 2100rpm and I don't have the problem. From what I can tell now is that a sensor is incorrectly reporting temperatures intermittently. It may not be the MLB or the graphics card specifically, but the cable connecting the sensor to the board. I ran AHT after the last time it did this and it failed a sensor, but after running ASD on the machine it passed all the hardware. I'm bringing it back into my shop later this month and if i can remember i'll post here with the resolution, not much I can do at home beyond software diagnostics.

IMac G5 fan noise

Hi MGW,
Baby Boomer recommended that I check with you about our iMac G5 fan noise since you used to have the same model. For a reference as to what all has been suggested and done go to: http://discussions.apple.com/thread.jspa?messageID=9810894&#9810894
I've done some internet searches and come across some other ideas on what may be the problem and if it is not too much trouble I would be very interested in your thoughts about the suggestions by DeathStalker13 --- please scroll down to #19 at this link:
http://forums.macosxhints.com/showthread.php?t=50158
Here is another link that I've found information about iMac G5 fan noise. I'd also like your impression about the methods that these people have done to solve the issue:
http://scienceman.com/legacypgs/00imacG5fanforum.html
I've also contacted a local AASP store and from just our telephone conversation they think just cleaning the fans and inspecting the computer which would take 1-1/2 hours at $95/hour should take care of the problem.
We'd really appreciate you opinion. Thanks!!!

Thank you so much for answering so quickly. I apologize for not being able to do the same. We had unexpected house guests and everything else was set aside while they were here.
This morning I have been researching trying to figure out how to disable Flash but so far I've been unsuccessful. We have a Power PC Mac OS X 10.4.11, Safari version 3.2.1.
Under the Safari "Help" it says, "Safari works with the plug-ins that are installed with Mac OS X. To see a list of installed plug-ins, open Safari and choose Help > Installed Plug-ins."
I checked and the Installed Plug-Ins list only has one "FLASH" listed - Shockwave Flash. I didn't know how to disable it or if I should.
You suggested changing to Firefox or Camino. We already swap between Safari & Firefox (version 3.0.12) for other reasons. Unfortunately, the fan noise is the same whether we use Firefox or Safari.
It was interesting that under Firefox "Help" they recommended disabling Adobe Flash plugin: http://support.mozilla.com/en-US/kb/Usingthe+Flash+Plugin+withFirefox?style_mode=inproduct
They said something about, "vulnerable to an extremely malicious exploit" and that until Adobe has an update, you can disable Flash. I followed the instructions but the only plug-ins I found were the following:
Default Plug-In
Netscape Navigator Default Plug-In
Java Embedding Plugin 0.9.6.4
Runs Java applets using the latest installed version of Java. For more information: Java Embedding Plugin. Run version test: Java information.
Java Plug-in
Java 1.3.1 Plug-in
Java Plug-In (CFM)
Java 1.3.1 Plug-in (CFM)
QuickTime Plug-in 7.6.2
The QuickTime Plugin allows you to view a wide variety of multimedia content in web pages. For more information, visit the QuickTime web site.
Shockwave Flash
Shockwave Flash 9.0 r159
Shockwave for Director
Macromedia Shockwave for Director Netscape plug-in, version 10.1.1
I haven't changed anything yet, as I'm not sure what I should disable. We have considered putting up with the fan noise since it isn't as bad since we cleaned the fans but if there is an easy fix we'd really appreciate your advice. Thanks!

Right fan never runs (but works)???

Hey mac gurus.
SO I have a used (new to me ) PB alum 15" hi-res and the right fan never turns on. I ran the apple hardware test from the original cd/dvd (thanks for that everyone, didn't know it existed until I searched here!) and when the logic board test is run, I can hear and feel the fan spin up.
So I know that power goes to it, but according to iStat and my ear (can hear and feel when the fan is at speed) The Left fan works fine, and I can hear/feel that too.
is it a heat sensor issue?!?
Thanks!
-Doug

Try installing G4FanControl:
http://www.andreafabrizi.it/?g4fancontrol
This utility allows you to control the temperature thresholds at which the fans kick in, so you could experiment by drastically lowering the threshold to force it into action.
The version I've got was free and works well, but the current version costs 15USD. Not sure if there is a free trial period.

Why fans never stop (macbook pro)?

I have a macbook pro retina and it's fans never goes under 2000 rpm, even if i have no app running... and even if the cpu temperature is 20 celsius, fans never slow down...
I can't believe that fans never stops in my macbook pro retina display that bought in movember 2013...

Andryxy wrote:
fans never goes under 2000 rpm, even if i have no app running...
Well this is a good report- you know your Mac is functioning how it was designed.
Fans are always running. And have always ran continuously, Retina model or otherwise.
Idle speed is ~2000rpm
If your Mac is under a heavy load the fans can ramp up to ~6000rpm. At that point you know your fans are on!

My Imac 's fan goes haywire when screensaver and/ or shutdown takes place

My 14 month old apple Imac's fan goes crazy when the screensaver and /or shutdown takes place.. otherwise it works beautifully and does not normaly make any noise at all.
Thank you..

Hi Gillal,
If your the fans in your iMac fans are running frequently it may be that your computer is overheating for any number of reasons. This article should help you understand how they work -
Learn about the fans in your Mac
If the iMac seems to be using the fans when it should not be, you may want to reset your iMac's System Management Controller. See this article for the steps to do so -
Intel-based Macs: Resetting the System Management Controller (SMC)
Thanks for using Apple Support Communities.
Best,
Brett L

PowerBook fans never rev up...

when hot. The fan is always on at low rpm (has this low hum sound) kinda like the new MacBook firmware update effects on fan. My powerbook fans never rev up when hot but remain at the low rpm level despite the fact that the machine scorches. In fact, the only time i hear the fan rev up is during hardware tests
Anyone know if i can adjust fan settings or something?

I would not attempt to adjust the fan settings.
Check though whether or not your hardware test detects any abnormal hardware issues with the fan:
http://docs.info.apple.com/article.html?artnum=86287
If there are none, recognize, it is normal for the machine to remain hot:
http://docs.info.apple.com/article.html?artnum=30612

IMac G3 Fan outside ????

all imac have Fan in side.... my iMac 450 MHz G3 DV ( sage ) don't have Fan. it is possible to fit fan but not inside outside.( handle area ) sucking air from inside to outside . there is no air flow inside.?????

Keep in mind, i got this computer to just play with and expand, so i dont care if its necessary or not. It was fun taking it apart! I used a 3 speed fan with blue led lights and cut a hole in the case where the CRT compartment is. I was VERY careful around the CRT, baddd things happen otherwise. Anyways, i used a dremel to cut the hole. I set the fan on high, but its just way too loud for my taste, so i may go back and turn it down. It seems to be working fine and ***** alot of air through the case!
http://www.putfile.com/pic.php?img=4757801
http://www.putfile.com/pic.php?img=4757800
iMac G3 Mac OS X (10.3)
iMac G3 Mac OS X (10.4.8)
iMac G3 Mac OS X (10.4.8)

T42P overheat - fan never kicks into "fast" mode?

I have a T42P (2373-KXU) with a 2GHz processor which seems to be overheating and yet there doesn't seem to be anything obviously wrong with the hardware. What's interesting to me is that the fan runs at a low speed most of the time and it *never* seems to kick into the fast / noisy / jet engine taking off mode during normal operation that I know and love from my T43 work laptop (although it is probably capable of doing this). I can't pin down exactly when the laptop started doing this - it's been doing it for several months but it's not usually a problem since the laptop spends a lot of its time doing fairly low intensity emailing and browsing. I'm wondering if the embedded controller firmware (3.04 - the latest) is to blame. I know that various fixes went into the firmware over the years to address a "fan pulses at full speed" issue, and I wonder if they fixed it a little too aggressively. The fan is certainly capable of the full speed mode - it does it once during boot up and one of the diagnostic tests in the Rescue and Recovery partition forces the fan to do it for a short period.
Anybody else experienced similar issues?
Here is the background....
Several times now when it was doing fairly intensive CPU and hard drive activities it would simply power off, for example during backups and virus scans.
After a couple of times (and from feeling the heat off the bottom of the case) I realised it was probably overheating. I confirmed this with Notebook Hardware Control: http://www.pbus-167.com/ - I can see the temperature climb. Generally I have the CPU in "dynamic switching" mode so most of the time the CPU is actually running at 600MHz / 0.998V - and the CPU temperature sits at around 44-48 degrees C and everything is fine. When it's very busy doing something (virus check, backup, IE getting in a twist) the clock goes up to 2000 MHz / 1.3v and after long periods the CPU temperature can sour to 80 degrees+. When it hits 95 degrees the thinkpad just switches itself off. If I put the CPU into "full performance" mode (i.e. turning off the speed-step feature and running the CPU at 2GHz all the time), the CPU temp climbs steadily until NHC starts warning me about the CPU temp.
So, my first thought was that the fan was dead, but there is a balmy breeze coming out the side most of the time along with a low volume fan noise. My second thought is that there is an accumulation of dust on the inside, or the fan/heatsink is no longer in good thermal contact with the various hot bits. I haven't checked this yet, but just before I opened it up to look it occurred to me that the fan never gets above a fairly low/quiet speed. On my work T43, when a process goes crazy and starts consuming 100% CPU I can usually tell by the fan kicking into full speed (plus a burning sensation in my lap), however, it never powers off. The T42P never seems to kick into fast mode.
The tp4xfancontrol program (http://sourceforge.net/projects/tp4xfancontrol/) doesn't seem to work for me (switching to "smart" mode doesn't appear to work) so I can't see what the effect of changing the fan speed would be. I can't find any obvious way of controlling the fan manually from within Windows. Notebook hardware control doesn't seem to have any options for affecting fan speed or the temperature at which the fan speed should change.
The next step for me is to try giving the inside a clean out or re-seat the heatsinks. I don't want to do that unless I have to for fear of breaking the laptop. I've written a support email and I'll see if this posting gets any responses.
I realise that this may be an unusual situation so please post if you have a similar situation. From what I can see the 2373-KXU was a fairly unusual model and having the 2GHz CPU in the chassis is probably on the extreme end of the heat spectrum - most of the T42Ps I've seen have slower speeds and will generate less heat. It may be that IBM / lenovo just didn't find this problem.
Thanks!

Welcome to the forum!
Dothan 2.0 CPU that you have in your machine should run nowhere near as hot as what you're decribing, so there's something very wrong there...BTW, T42p was also available with 2.1 and that was really hot...
If your machine has warranty remaining, give IBM/Lenovo a call and have it looked at.
If not, download the Hardware Maintance Manual from Lenovo's site and remove the heatsink, clean everything and re-apply some Arctic Silver...hopefully this will lower the temps...
Good luck and let us know.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

2740p fan never turn off

I have brand new 2740p laptop and its fan never stop. Even when the cpu usage is 0%. It's constantly blow cold air and make noise. Is this normal for this model or is there something wrong ?

OK.
I don't know why that is happening then.
I read the release notes for your latest BIOS update and that doesn't address a fan constantly running issue.
I suggest you contact HP technical support for further assistance, since your notebook is new and still should be under warranty. It is possible there is a bad thermal bond between the processor and other chips.
If it is a brand new PC, you may want to give it a week of start up and shut downs to make sure these parts have had time to establish a good thermal transfer as the thermal compound needs a litte time to make the optimum contact between heat sink and affected chips.
Paul

Fan never turns on

i have a macbook pro and realized in the past few weeks that my fan never comes on, causing my mac to get extremely hot. i can't think of anything that i have done in the past weeks to change whether or not my fan turns on...any ideas how to fix this?
i would really appreciate the help!

When you say your fan doesn't come on, how are you measuring that? If you haven't yet, install iStatPro, which is a system monitoring widget which will tell you the speed of your fans. Most MBPs have fans that idle around 2,000 rpm all the time, and then increase in speed when needed to get rid of heat. iStatpro will also tell you the temperatures in the machine, so that you can see how hot it truly is getting.
Another thing to try first, is to run the Apple Hardware Test on the install disc 1 that came with the computer. This will test all the components, including the temperature sensors and the fans in the computer. If the fans are truly not working, you'll need to call Applecare or visit the Apple store to get things fixed.

My iMac G5 Fans run at full speed when using regular everyday applications.

When using just normal everyday applications such as using about 30 min of Safari to surf the web or maybe something else, my fans run at full speed. I have just got a new logic board replacing my old faulty one. How can I fix the fan problem?
Thanks!

Hi again Miriam,
With more news for you and iMacG5 on the fans go crazy. I just got back my computer from the repair center. After more than a week under observation, the technician told me that they just couldn't replicate the problem. They had the computer running non-stop during all this time, not even allowingit to go to sleeo mode and nothing.
The CPU fan never went beyond 2300 rpm (or so) and never went to sleep mode on and off by itself. Furthermore, they ran all possible tests and everything comes back as OK.
Right now I have a movie running on the background, together with a photo processing software open and other smaller processes and the CPU fan is running at 4361 rpm !!! the temp of the CPU is 66.3 Celsius.
Any thoughts??? It's really making me crazy because the computer was neverlike this and now it sounds like a hair dryer. I emphasized with them the fact that this just started after they changed the logic board and as coincidence after Ioaded the security update 2006_04. The technician told me it may be software related. If the computer doesn't go to sleep by itself, then he recommended to reload the operating system.
Any comments appreciated.
Zwirek

IMac 27'' fan never below 1700rpm

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