OS X :: CPU Fan Running At Full Speed All The Time

Mar 4, 2010

20'' Aluminium iMac, 2.4ghz, 4GB RAM, 2133.

My internal hard drive recently fatally crashed out so I replaced the hard drive with a nice big 1TB one. Since i put the machine back together and reinstalled OSX (Leopard 10.5), this fan has been going constantly:

The one you can see at the bottom there. I guess its the CPU

I installed the iStat widget to check what the temperatures were like inside. I got this back:

By this point I'm assuming the sensor/s is either disconnected or something worse, and the fan is being clever and safe by running all the time. So I open it up and check the connections which seem to be fine, but i give them a blow etc and THEN I got a reading on the temps, and the fan was working nice and calm. I closed her up, and typically, the problem started again.

I assumed that the case had something to do with it, pressing on the sensor or something. Which it wasn't.

I did all the things I did the first time again, but this time with no temperature readings at any stage.

Now I'm not sure what to do. The fan is running at full speed all the time and I have no temperature readings, save the two shown above. I also tried the application 'Temperature Monitor' with the same results.

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Machine: iMac intel core 2  2.66Ghz Model A1224

sn# YM******ZE3 

Ran the hardware test by pressing 'D' key. hardware test came back with error :4SN/1/40000000: T00P-65.250 

I am guessing some sort of temp sensor might need replacing. 

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Apr 14, 2010

So today I opened up my MBP to clean it out and stuff (it had a ton of dust... A wall of it had built up where the fans blow out)All is fine and dandy now except for one thing. Since I don't want to open my case up for the second time today (right fan wasn't plugged in all the way first time I started it up... oops x( ) I'm asking here since everything else seems to be fine.

What I did:
Opened everything up all the way down to the heatsink.Applied correct amount of Thermal paste.plugged everything back in (right fan wasn't perfect at first, but fixed and stupidly didn't double check everything else while I was in there)

And now both fans are running at 6k (full) constantly. I tried resetting PRAM and SMC with no luck. I'm about to grab my disk 1 and run the diagnosis to see if that turns up anything.Are there any plugs that I might have accidentally not plugged in all the way or at all that would cause this? Also any other suggestions if everything is plugged in correctly?

MacBook Pro 2,2 15.4" late '06
10.6.3
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Also, I have iStat Menu. No apps using all my CPU (Mostly <10% usage right now) and temp is mostly <40c right now. All temps have a temperature so I'm assuming all heat sensors are fine.On a great note: My computer is so much cooler now! Even before this at 6k rpm I'd get down to MAYBE 45c if I was lucky.I also have Fan Control installed and it's not having any effect

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Sep 3, 2010

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It's a 2.0 GHz dual-processor with 8x AGP video. I checked it out and the only thing "wrong" with it is that someone has set up the fans, all of them, to run full-speed all the time.First, how did they most likely do that and, second, how can I return the fans to their normal operation. This can't be good for the computer and it's so loud and annoying that I'd rather use my G4.It's a great computer otherwise, I hope they didn't do something permanent that would require a new motherboard, that's not in my budget.

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I recently purchased an X800 and installed in my G5 1.8DP (OS X 10.4.9) with the intention of having something to drive my shiney new 30" Cinema display. All booted fine and, in glorious wide-o-vision, I spent the next 30 mins playing with all of this extra screen real-estate. At that point, I started to notice that things were not as quiet as I'd initially anticipated.

In fact, the amount of fan noise was so high that I'm not going to be able to use the new card as the machine is part of a project recording studio installation. Doh! So, a quick trawl of the ATI web site lead me to the ROM updates claiming to address fan speed control.

Update to the most recent version of the ROM and no change. Similarly, I've installed the most recent version of teh ATI control panel.

Odd as other people seem to be saying that they're not experiencing the same problem. And strangely, the GFX card fan runs at a low "normal" speed in Safe Boot mode whilst installing the ROM updates.

Information:
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Information:
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Feb 22, 2010

After resetting my Mac mini with the PMU reset it

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Any way how to fix that? I did a PRAM and PMU reset again, but no go.

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Info:
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Is there any way to set the fan speed manually, say in openfirmware?

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My Mac OS X  as soon as I turn it on the fan is running. I have already gone thru the reset SMC . Could I have too much stuff in it?

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Apr 11, 2012

I have a 27" iMac that I recently took to the Apple Store to have the LCD replaced.  When I got my machine back and started it up, the fans kicked on full speed and will not stop...this didn't happen prior to me taking it to repair...it ran nearly silent.My firmware and so forth is all up to date.... I downloaded SMC Fan Control to see what was going on... my computer is operating at 97 degrees farenheit. but my CPU fan is spinning at 4035 rpm. That's crazy over the top. Optical drive fan (with no disk in it) is spinning at 3736rpm...and my HD fan is at 1098rpm (which is probably about right. 

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Aug 27, 2014

My iMac runs perfectly fine; more or less as it did when it was new. In OS X, when I shut down the computer, the fan runs at full speed indefinitely, unless I unplug it or boot back up.  When running, the fan is perfectly normal (increases speed a bit when doing something taxing).  I've never heard it at full speed before until this started happening.  After following the SMC reset procedure with no luck (I'd like to add that the SMC reset only says it relates to fan problems when the computer is ON), I searched a bit and noticed there are one or two cases where a problem like mine was believed to be a motherboard issue, and therefore a costly fix. 

However, here's the fun part. When booted into Windows 8.1, shutting down the iMac does not cause this issue to occur.  It stays silent, as it should, even if I disconnect then reconnect the power.  This leads me to believe it's unlikely to be a motherboard issue.  However I've wiped, restored, and reinstalled fresh copies of Mountain Lion, Mavericks, and Windows 8.1, and the result is still the same: if I don't want to have to unplug it from the wall, then I have to use Windows to shut it down. 

So then, my questions are these:

-What is the difference between shutting down from OS X and shutting down from Windows?

-Is an operating system allowed/able to touch BIOS settings?

-Is it possible to still be a hardware problem, given this difference? 

My default OS is OS X, and it makes no difference if I change that to Windows.  I also did a PRAM reset, even though that has nothing to do with fans...

Info:
iMac, OS X Mavericks (10.9.4)

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