15 " MBP C2D fans running at full speed all the time

hi
just purchased new MBP C2D 15 inch, the fans are running all the time at full speed (or at least sound noisy).
i know there were several updates on earlier machines but none for this one that i can see.
SMC Version: 1.12f5.
any idea's please.
thanks

A very reasonable thought although it's clearly not DOA. Nor do we know whether it was bought as a CTO or not. The requirements for classing a system DOA are very clear and this system, while possibly not operating correctly, certainly is not a DOA.
I would however make every effort to determine the cause of the problem. Potentially the issue can be caused through software and no fault of Apple. Being able to quantify an issue does go a long way to resolving it.

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Fan runs at full speed all the time

The fan on my brand new iMac 17" runs at full speed all the time, creating an unbearable amount of noise. The activity monitor shows 99% spare time, i.e. nothing much is running.
I updated all software, checked the firmware version (it was the latest already) and performed an SMC reset. I also unplugged it for several hours, as some people have suggested.
I downloaded smcFanControl and it says that the ODD fan is running at 5200 rpm all the time. The CPU and HDD fans seem to run at normal speeds. smcFanControl also reports a cool 39 deg.
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I don't have a solution but thought I'd add a computer that showed the same behaivor.
A 20" iMac I was configuring for my company did the same thing, but just once so far. I used it briefly just out of the box and didn't have any problems. It's a stock install of OS X 10.4.8, no other software installed. Turned it on several days later and the fans ran during the 2 hours I used it to run Safari via Airport. I turned if off after it started to smell like hot electrical components. Activity monitor looks completely normal. After shutting it off for two hours, unplugging and re-plugging AC and keyboard, it came back on with no fans. I did not do the SMC reset or any updates between the power cycle.
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http://daringfireball.net/2006/04/repairpermissionsvoodoo

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Hi folks,
Apologies if this has been answered before - I tried to use the search but to no avail!
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Hiya,
Thanks for your thoughts. Yup, I'm starting to think this is just one of those things and I need to swap for something with passive cooling. The mac fans seem to be fine although there have been moments when they decide to have a mad minute or two. I think the card next to the graphics card (digidesign core card) is not going to help. Was previously pretty acceptable at normal monitoring levels with the 5200 Nvidia but now you can hear the machine over conversation levels which is tedious. Was thinking about moving the machine to another room or get a quiet rack to house everything but it might be easier to use the cash for a Magma chassic and use my Powerbook. Or stop using Protools and go for Logic? lol! .....
So, anyone want to swap an X800 for a 9600? Ebay, here we come ...
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Hi Appleians!
I have an iMac 20inch with 8GB RAM and its an i3 intel processor. I purchased it from a friend of mine who had replaced the original hard drive with another that amounts to a terabyte. Now the fans are running at full speed all the time making it way too noisy to work with. It however works smoothly with no problems except the fans are irritating, it does not heat up though. Anyone with a solution? I tried resseting the SMC it didnt work.
`Oh and the computer is running on Mavericks.
Please help!

See the suggestions by mende1 here > Mac fan runs all the time

Fans running at high speed all the time

Hi,
I still haven't found a fix for full throttle fans at start up and session on my imac 11,3 mid-2010, 27", 2.8Ghz, i5 since Mavricks installed.
CPU temp 72 degrees F, CPU fan 3992 rpm, optical drive fan 3589 rpm, CPU usage <2%. Installed boot rom 1M112.0057.B01 is the latest version available.
Resetting PRAM & SMC don't work. As with others with mid-2010, 27" macs running 10.9, AHT does not work with the D key or the Option/D keys, so no hardware test.
Worked fine with 10.8.
If someone has a working solution, please let me know. Otherwise I will have to wait for Apple to release a fix. The fan noise is extremel annoying.
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I hate to say this but 72º F for the CPU is not hot. Did you have a hard drive replaced recently?
Open Activity Monitor in the Utilities folder. Select All Processes from the Processes dropdown menu. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.

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My left side fan is running at full speed all the time. I have downloaded free fan speed control app but does not help. Any advise

Fan Control Apps/Utilities generally can only raise the speed of the fans and not lower them.
Disable, turn off or uninstall whatever Fan Control that you installed and reset the SMC.
see > Intel-based Macs: Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
Then if the iMac's fan is still running fast, you probably have a loose sensor cable or bad thermal sensor and the iMac needs to be taken into service
see > Apple - Support - iMac - Service FAQ

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I purchased an "Open box" Mac mini Intel Core Duo, 1.66Ghz, 2G ram, 80G HD and SD a few days ago from Fry's.
It runs beautifully except the fan is very loud compared to any Mac my family has ever had. It is so loud that we were thinking of putting it under the desk.
The fan runs constantly, and I mean all the time, at a high speed. You can really feel the air coming out the exhaust vents. The case is always cool to the touch as is the exhaust air.
My aunt bought a similar Mac mini (But only 512Mb ram) the same day. Her's is very quiet. The case feels just slightly warm, not unlike other Mac mini's I've seen.
Should my Mac mini's fan be running this way?
Thanks,
llulua
BTW: The "open box" was sealed with a Fry's label and it said that this had a new warranty. Yet, checking the serial number, it said that it had about 260 days left. I guess Fry's is backing it?
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Since you have 2 gigs of memory, my thoughts are that when the party (Fry's or the origianl purchaser) upgraded the memory, they neglected to reattach the wire at the front of the Mini under the IR receptor at the right front corner that regulates the fan speed. This wire must be unattached in order to upgrade the memory, and is probably why the original person brought it back, because of the fan noise resulting from failing to reattach the wire. If that wire is left unattached, the fan runs continually at high speed to protect the CPU and system in general. If you do not want to use a putty knife to open the Mini, take it back to Fry's and ask someone who is Mac savvy to open it and reattach the small plastic receptacle at the end of the wire into its socket at the right front of the machine. When I go to Fry's, I am always concerned because the employees allow people to pry keys off of the Apple notebooks, so don't expect that their employees to know or care about anything Mac.
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Hello,
my Mac mini suffers from a very strange problem. I've had it for half a year now and recently bought a new power adaptor since my old one got damaged. I plugged it in and everything was fine - until half an hour afterwards, when the fan suddenly made itself noticeable at full speed. But it didn't stop; it went on, curiously even when I shut the Mac mini down. That's right. even when the system's turned off. The noise is really unbearable and only stops when I plug off the power cord.
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I was told on another forum to try resetting the PMU, which I will try when I get home today. If it works, I'll post. Seems unlikely though since the fan runs even when the Mini is powered down.
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CPUZ REPORTING FULL SPEED ALL THE TIME, help ?

I have cpuz 1.52.2, its constantly reporting that my cpu is running at full speed, it didnt used to be like this, and ive not even been doing anything at all in the bios for months, so i know its not the bios to blame.
I have a dual boot system, with windows 7 ultimate 64 bit and windows xp pro.
As i say, i cant remember seeing this issue happen before, so i dont know whats the cause, ive even tried lowering the power saving levels in windows control panel, but that dont appear to do anything either, unless iam doing it the wrong way.
Can someone help me please as i have this vision in my mind that with my overclocked cpu running at full speed constantly that its not doing it any good.
Thanks.
p.s
i have always had turbo boost enabled, so that way the speed should go up and down, i know as ive been tracking it before.

Hiya,
Thanks for your thoughts. Yup, I'm starting to think this is just one of those things and I need to swap for something with passive cooling. The mac fans seem to be fine although there have been moments when they decide to have a mad minute or two. I think the card next to the graphics card (digidesign core card) is not going to help. Was previously pretty acceptable at normal monitoring levels with the 5200 Nvidia but now you can hear the machine over conversation levels which is tedious. Was thinking about moving the machine to another room or get a quiet rack to house everything but it might be easier to use the cash for a Magma chassic and use my Powerbook. Or stop using Protools and go for Logic? lol! .....
So, anyone want to swap an X800 for a 9600? Ebay, here we come ...
Cheers,
Mike

Fan runs at max almost all the time on a 2.16GHz MacBook Pro

My fans are running at 6000 rpm for no reason. I've noticed this for a while but now I realize something is wrong.
I tried resetting the SMC (pulled the battery, held power button down for 5 seconds) and no luck. As soon as I turn it on and it comes up with the log in screen, the fans are running at 6000 rpm. I have 51 processes running right now and the one using the most cpu is activity monitor at about 2 to 4 ('m assuming percent).
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And has anybody else had a similar problem?
Should I redownload and reinstall the firmware update for this model, I think I recall a while back a fan firmware update for it?

I've had the same problem.
On my 2.16 C2D MBP it was the thermal sensor of the GPU's heatsink that was intermittendly losing connection (you can see that in programs like Temperature Monitor and Hardware Monitor).
I opened up my MBP and reseated all the little sensor connectors I could see and now it works again...
First I'd run Apple Hardware Test from the installation DVD, it may throw an error that you could post.
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I accidentally shorted the case fan circuitry on my HP motherboard (explanation below) and now the fan runs at full speed all the time. Other than the fact that is was a stupid thing to do, will it be a problem long-term and should I try to reset the fan speed switch?
(Long Version) It is hot around here these days and my computer fans seemed underpowered. I put a splitter on the case fan outlet on the motherboard and added a second fan in addition to the original fan. It all worked fine except the new fan seemed to run pretty slow. I wanted to get a voltage reading from the fan plug but I accidently touched the two sensors on my volt meter and the computer immediately shut down. It started up and worked fine except the throttle was no longer working and the fans were running at full speed. This also explained why the second fan was running slowly before when they were both being throttled.
I guess in the end I got my wish to have my fans running at full power, I just wanted to see if there will be any future problems leaving it this way.
This question was solved.
View Solution.

Hello design_guy,
You should not have any problems with the fans running at full speed other than the fact you may decrease the life cycle of the fan.
You may want to install some software on the computer that will allow you to adjust the fan speed from the computer which may help you prolong the life of the fans and give you a little control over them.
Something like SpeedFan should do the trick.
If I have helped you in any way click the Kudos button to say Thanks.
The community works together, click Accept as Solution on the post that solves your issue for other members of the community to benefit from the solution.
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Very noisy iMac, fans running at full speed even when performing smal tasks

I have a 2009 21 iMac, recently the computer became very noisy with the fans running at full speed all the time even when checking the email or just using Safari. I don't do anything crazy like 3d renderings so I don't know why the fans wont stop. I recently cleaned it but this didn't seem to solve the problem.
Anyone knows what's the problem and how can I fix it?
Thanks

Hello irisfailsafe
Welcome to Apple Discussions
Reset the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
Dennis

G5 fans - runs at full speed

One of my MACs (G5 2.0DP) can't slow down - the fans runs at full speed all the time (OSX 10.3.9) - hardware test - PMU - disconnect powersupply - exit single user mode - I think I did all that's in the "book" - but the fans are still running at full speed - all the time.
any ideas?

Hello,
I am not sure if you have the same issue, but I might be worth it for you to read the archive:
http://discussions.apple.com/thread.jspa?threadID=561296&start=0&tstart=0
And here is the end of my story:
Regarding my issue with the fan fan full force, yes it was resolved... but not without fighting for it!
Fortunately the machine was still under warranty, and I left it with Apple care during an oversea trip in August. End of August I picked it up suppositely fixed and after a few hours of work I noticed the same symptoms were still there! You can be sure I made it clear to Apple service I was not happy. I left the machine again for a week and 1/2 and picked it up again. They told me they replace the logic board. Again a few hours of work of testing and this time I could repeatidly hang up the machine. Back to Apple, I told them I didn't want to pick it up until they REALLY tested it! This time they replace the logic borad again, the power supply and something else?...
Anyway since then the machine works just like it did before : great, no hardware system related issues.
Unfortunately I cannot tell you for sure what was the problem: logic board? CPUs? power supply?... and I could not get the information from Apple care, especially I would have been interested in the specific procedure they follow to fix my problem... but for some reasons they don't want to share this information...
I hope your machine is still under warranty... other wise you'll have to weigh the pros and cons to have it fixed, especially if they replace the logic board ($900 I believe) or any other main components...
I hope this help,
Good luck,
David
Dual 2 GHz PowerPC G5 Mac OS X (10.4.8)

Fan running at full speed and all the time!

Hi,
I was wondering what could be the reason for my fan running on full speed at all times?
It is pretty annoying especially when I am in a quiet room. This just started happening this morning and I thought it was just going to stop but it didn't so I restarted my MacBook and shut it down also and still no luck.
Oh...
My battery meter only says 1:45 after I just took it off the charger when it said it was fully charged and I had the green light on my charger.
What could be the reasons for these two things?
Thanks,
Sam

I reset the PMU and the fan is still going at full blast right when the MacBook starts up.
Will I know that the PMU is reset or will it just fix the problem if it is?
Does anyone know a solution?
The computer is running fine but it's just the fan that is really loud and going at full speed and the battery life is extremely short for some reason.

I have a dual 1.8 ghz pwer pc g5 and sometimes i put it in sleep mode and come home on my lunch break and the fan is running at full speed and the computer has frozen up...what is going on here?

and sometimes i put it in sleep mode and come home on my lunch break and the fan is running at full speed and the computer has frozen up...what is going on here? is it a virus or has my computer been hijacked? it cant be good for the computer...anyone ever had this problem..?

Your problem has been reported many times, but causes are as varied as individuals.
Can we assume that a hard shutdown allows a normal restart?
Can I assume that you have used Disk Utility from your OS X install disc to repair the hard drive directory? The freezes and hard shutdowns require that the drive be repaired (not permissions) or soon the machine won't boot at all.
If the root issue is software related, in Console (the application) under Logs, there should be loggings around the time of sleep and logs that tell you what process went wild and froze the machine.
Network activity is also a common casue.
Other info:
http://support.apple.com/kb/ht1776
If hardware related, such as an external drive, other USB device (Wacom tablet) or USB PCI card, ejecting, disconnecting, removing, or in the case of the Wacom, updating drivers, are all potential remedies.

15 " MBP C2D fans running at full speed all the time

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