Cooling fan just came on full speed

Freaked me out. Didn't know there was a cooling fan.
How do I get it to turn off?
It started up when I started a program. Restarting and shutdown doesn't make a difference.
There haven't been any recent updates described as "firmware". All recent SW updates have been applied.
Got a phone call the other day asking if I wanted to extend the warranty. I said "No". Hmm.

Dave
Welcome to Discussions
First try resetting your SMC!
Open this link for the instructions:
http://docs.info.apple.com/article.html?artnum=303446
Dennis
17" iMac Intel Core Duo 1.5GB Ram Mac OS X (10.4.8) Maxtor 300GB FireWire 2G Nano

Similar Messages

Fans are running at full speed after hard drive upgrade. Used same brand drive.

My Western Digital 500GB hard drive crashed. The date on it is Aug. 2010. I swapped it out for a Western Digital Caviar Black 1TB. All plugs were identical including the temp sensor cable. My fans now run at full speed. What gives? BTW. This is th 3rd WD hard drive to fail at my office in multiple iMacs. I have a 21.5 iMac i3 3.06ghz. I have tried the SMC reset,.. no luck. Reset the PRAM,.. no luck. Hard drive and computer function perfectly, it just sounds like a loud annoying PC.

After a little more research the only thing I found for 21.5" mid 2010 imac were three part numbers for three sensor cables which are a function of vendor:
922-9215, Hitachi
922-9216, Seagate
922-9622, Western Digital
The strange thing here is these are vendor specific and not model within vendor specific. So you started with a WD drive and replaced it with different model, but still a WD drive. So you would think it would require the same sensor cable.
Maybe the drives are different enough for this to matter. Or maybe you should check the connections one more time. Be it model of drive or connections, whichever it is, the sensor cable is the source of your problem.

MY FAN IS ALWAYS ON FULL SPEED

Please help out there my MB fan is always on full speed especially when whatching ovies on Batt power which drains my batt quick. and i was not like that before

especially when whatching \[m?\]ovies on Batt power
First, movies are CPU-intensive tasks, which may explain the need for fan speed. That might not be all, though.
The thing to do it run /Applications/Utilities/Activity Monitor to see which processes are using the most CPU. It's entirely possible that you have some runaway process running that's causing the system to run hot, and therefore need additional cooling.

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.

G5 Dual 1.8 GHz fans gradually go to full speed and stay there

My G5 Dual 1.8 GHz boots normally and quietly, with no freezes or panics. However, within a minute or so, I hear the fans begin to gradually gain speed. This continues for a couple of minutes until the fans reach maximum speed, making my room sound like a wind tunnel. This occurs with no programs running, just sitting idle at the Finder desktop.
I've checked the CPU & system temperatures using the shareware utility "Temperature Monitor 2.5" and everything is running cool, barely above room ambient, so there is no thermal reason for the fans to "take-off" like this as the heat pipes are doing their jobs to cool the CPUs.
There is no restriction on air flow around the case, and the acrylic side panel is installed. Interestingly, removing the side panel seems to have no effect on fan speed, whether installed or not ... maybe it's just the liquid cooled G5s, but isn't removing the side panel suppose to force the fans to full speed?
I was wondering if this out of control fan speed is a known issue that can be resolved with either a firmware update or software patch? Does this indicate the need for a thermal recalibration?

I've since answered my own question on this ... The reseller had installed OSX 10.3.2 as the boot OS. The (Late 2004) DP 1.8 GHz G5 requires 10.3.5 minimum, and with that update, the problem went away. The G5 now runs quietly.
This was far simpler than I had expected. Thanks.

HP Spectre XT 13-2005tu - Cooling Fan Countiniously Running At Top Speed From Start Up

Ok, Here's a puzzler if anyone can help. HP Spectre XT 13-2005tui7-3517U @ 1.90Ghz4.00 GB Ram256 SSD HD Has been a great laptop, very happy with it, small light powerful, etc, good battery life, everything I needed as student and as someone who travels a lot for work. Towards the end of 2014 the hinges on the screen gave out. Outside of the warranty period HP were kind enough to fix it, however this didnt get completed until approximately Feb 2015 - when I returned from travelling. At the time they gave it a full service - cleaned it up, updated bios, replaced fan. The cooling fan was replaced as they claimed it was noisy, but to be honest I had never noticed it. As soon as I took it home, the fan went crazy. From the moment the power button was pressed it would run flat out and non-stop. Sometime it would change from flat out to nothing every two seconds for 5 minutes - I took a video of this at the time. I had planned to take it back to the service centre but after a few hours it returned to normal. There were no problems for a while, every now and again it would startup and run flat out constantly for an hour or so but would always go back to normal. A couple of days ago it started this again but just won't stop. The moment the button is pressed it is running flat out until the moment it goes to sleep or is turned off. It has also started with the occasinoal intermittent 'running flat out, then slowing down then flat out then slowing down' continiously over about 5 mins (I took a small video of this as well - https://youtu.be/P2ybdunCZf8). I have: - Updated anything and everything. - Formatted the pc and reinstalled windows. - Rolled back and reinstalled the bios. - Made sure the bios setting to constantly run the fan was off. - Checked that the fan was sqeaky clean. - Installed and monitored temps with HW Monitor - fans run flat out at any CPU temp. - Ran HP system diagnostics that show no errors. - Tried hard resets. - Also checked the CPU usage - fan runs at high speed whether 5% or 95% is being used. - Tried different power settings and changing the CPU Cooling policy within the power settings. I am out of ideas. I have a feeling it might be a hardware fault and that I'm doomed but I am keen to know if anyone else has any thoughts, and espeically if there is anything HP can do or recommend. Cheers

Hi , Thank you for your query. I understand that you had the display replaced by HP as it quit due to a hinge issue. When you got it back after they had done full service - cleaned it up, updated bios, replaced fan. The cooling fan was replaced as they claimed it was noisy, but to be honest you had never noticed it. As soon as you took it home and powered it on the fan went crazy,running at full speed non stop. The speed sometimes would change from full to nothing every 2-5 minutes. After a few hours it seemed to settle down and work normally.Occasionally the issue would return for a hour but then return to normal.A couple of days ago the issue returned but now remains constant. Here is a link to HP Notebook PCs - Fan is Noisy and Spins Constantly, PC is Warmer than Normal. As this did start just after the repair, I would contact HP support, explain the issues and get your options if the above has not helped.Please contact HP support at Contact HP Support. To say thanks for replying please click the thumbs up icon below.If this fixed your issue, be sure to let people know by choosing solution provided. Best of Luck!!

2012 iMac fan sporadically running at full speed.

I purchased a 21" iMac in October. In the last two weeks, the fan has started having issues. It will intermittintely run at full speed for anywhere from 5 to 20 seconds, and then shut off, only to max out again in a minute or so. The computer itself is cool to the touch, the only programs running are Finder and Google Chrome, and it's in a well ventilated and cool area. I've already reset the SMC and the PRAM, seeing if either of those solved the issue, but it is still occuring. Anyone have any idea what might be causing this?

Could be a defective sensor. You can also try Intel-based Macs: Resetting the System Management Controller (SMC) and see if fixes it. If the computer is newly purchased, then take it to the Apple Store for repair. it's in warranty.

One of my MacBook Pro's fans is running at full speed

Out of the blue today, my 2011 MacBook Pro started fans went mental when I awoke if from it's sleep. They started running at full speed, far louder than I've ever heard them before. I searched through other discussions and it suggested I try an SMC reset. I performed one of these with no success.
I then opened smcFanControl and noticed that my leftside fan was running at 7000rpm+ and the rightside fan was running at normal speed 2000rpm. It randomly spools on and off high speed and I cannot find any fixes or similar problems online. Can anyone suggest a fix for this or should I be taking it to a repairer?
FYI my logic board was only replaced in April under warranty so could it be faulty?

Hi andyBall_uk
SMC fan control measures temp also. Currently running at 47*C as you can see in the screenshot below. I tried overriding the fan speeds...works for the right fan but not the left one so it appears only the left fan has the fault.
The weird thing is, when you press your finger down anywhere on the left speaker next to the built-in keyboard, the fan slows back down to normal speed, but when you let go it speeds back up again. I might open it up in the morning to see if any of the connections are loose, because it seems weird that this happens with a small amount of pressure applied to the body. Also of you tilt the macbook it sometimes slows back down to normal speed (but sometimes stays at high speed). I will let you know how I go. Thanks for your suggestion/s

Fans go on at full speed 1 min. after computer goes to sleep

Problem: Fans go to full speed 1 min. after it goes to sleep-mode. The fans will stay on until it wakes up from sleep-mode.
Computer: Apple Power Mac G5 Dual 2.3, OS 10.4.9, 4.5 GB RAM. 2 HD, late 2005 version.
The problem happens every time I put it to sleep, even right after it has been turned on.
I have measured the CPU temp to be as low as 36-40C and it will still turn the fans on high speed when put to sleep.
I have reset the P-RAM and the SMU.
I have installed a fresh version of OS 10.4.9 on second drive, booted from it and it still turn the fans on 1 minute after it goes to sleep.
I have had all the RAM out beside the original RAM. I did an extended Apple Hardware test which passed.
...any ideas ?
-e
5 Macs in total Mac OS X (10.4.9)

After trying all that, it sounds like it's hardware-related--possible logic board--but try this yet.
Do an Open Firmware reset: Hold the CommandOption+OF keys during startup. At the '>' prompt type:
>reset-nvram
Return
>set-defaults
Return
>reset-all
Return
The reason the fans are taking off, is because the OS stops communicating with the logic board.
-Bmer
Mac Owners Support Group
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Mac Pro fans blowing continuously at full speed.

Hi guys, just bought a Mac Pro off someone. 2006 model, 2.0 quad core.
The guy was running two x western digital 500GB drives. But took them out and replaced it with a seagte ST3500413AS 500gb drive (new).
Mac OSX installed fine. But when i boot it up the fans go crazy! and dont stop.
Did a heat montior test and all looked okay, i think it was 30-50 degrees for every component.
Used istat and the figures for the fans were as follows:
Figures show approx:
Power suply 599rpm
Exhaust 1547rpm
CPU fan 499rpm
HD expansion 2865rpm
Now obviously somethings wrong. I took the drive out and pushed it back in to make sure it made good contact, i have swapped bays etc, same problem.
Any ideas guys?

Launch the Activity Monitor application and select the CPU tab. Click the heading of the "% CPU" column in the process table to sort the entries by CPU usage. You may have to click it twice to get the highest value at the top. What is it, and what is the process? Also post the values for "% User," "% System," and "% Idle" at the bottom of the window.

Cooling fans constantly run @ full speed after replacing the upper CPU??

After replacing the upper CPU on a Power Mac G5 (June 2004), Dual 1.8Ghz PowerPC, model M9454LL/A, all the cooling fans constantly run at full speed. All other operations are normal.
I've read, "...after replacing or switching CPU locations the Logic Board doesn't properly recognize the CPU's in their new location and a "Thermal Calibration" is needed". Could a "Thermal Calibration" possibly correct the constant full fan speed issue?
What software would be required?

Hi-
Could a "Thermal Calibration" possibly correct the constant full fan speed issue?
Yes.
What software would be required?
The Apple Service Diagnostic disc (ASD) of the proper version for your machine.
Call an authorized Apple service provider and arrange a calibration, as the disc is not readily available to individuals.

3000N100 cooling fan

A couple of days ago I noticed that the cooling fan was running at full speed continuously and blowing out cold air. Without shutting the PC down, I installed 'Speed Fan' and that showed 'Temp 1' at a whopping 76 degC which, clearly, it was not (cold air!). I shut down the PC and it restarted normally and, ever since, the fan has behaved normally and Speed Fan shows Temp 1 at about 48 degC. Is this a known problem, and should I raise it as a warranty issue?
Regards
John

Dear friends,
According to my experiences, fan speed will be faster when your CPU increase, in your cases 76c+/- fan should be running faster because the temperature increase, should be normal.
For your cases, if u facing this problem again, when your temperature is increase, u must checking, are you running some program is in process or is your program is scanning your computer or something else which still in running ? for example antivirus scanning on background or some flash website also can causes your increase of your usage of process)
You can also check, what program is highly processing, go to task manager (Control+Alt+Del) and under windows task manager u can click Processes tabs, in processes tab u can see CPU column, short the CPU column, u can see what program is running not stop... usually program will idle when u not process and in idle mode when u did not touch it (if the CPU column 99 = full process , 0=idle) if you some program running 85 continuously even u did not touch it, end that program and u should see the temperature will cool down.
Please notice that if u are running DOS Application in your windows, your temperature will be increase due to the DOS application when running is consume 100% processing process for some dos application.
For some cases, if your memory is not enough for your operating software, it may also can increase your processor usage because convert memory in virtual memory.... you also need to check your memory too... if your memory is out , than conversion to virtual memory will delay your speed because data convert and store at your hard disk and increase usage of your process and increase temperature.
If u have verify all the program is idle and the temperature is still high, it's may be your hard ware controller problem.
Nicholas K.H.Chai
Malaysia
YM: ckhown

Cooling fan for iMac G5 - at top speed

Even when only one program is open (like now with Firefox) the cooling fan is running at top speed.
Is there any way to check on why and solve the problem?

Hi jaygreenman,
Just wanted to suggest, since you are not receiving much help here, that you may want to post your topic over in the iMac G5 usage forum:
http://discussions.apple.com/forum.jspa?forumID=881
Do a search there for "fan running full speed" or something similar and you'll find a lot of topics dealing with fan problems.
Sorry that's all I can suggest but hope that helps some,
littleshoulders

Weird Mouse moving + Fan at FULL Speed + NO Power LED (Suddenly)

After having a minor issue on Can't Wake Up from Sleep using Apple Remote Desktop 2.2 (previous post) .... Tonite I got another surprise !!
Tonite, when I turned on my Mini (Intel), I noticed there are some weird movement on the Mouse pointer which happened before; however, since I used ARD as main control ... I will never notice such weird Mouse pointer behavior unless I plug-in and use an USB Mouse!
How weird? Say, I move the USB mouse from Left to Right ... the pointer move and all a sudden ... it disappeared then resurfaced back at the Starting Point which is the place where I started moving it !?! Sometimes, the USB mouse simply not functioning when I move it, the on-screen cursor "blinks" rapidly !!
( BTW ... keyboard seems not functionally too at that moment ... reboot ... things resume normal ... )
Already tried swap Keyboard, Mouse and different USB port too; no use!
Reset PRAM = NO use.
Reset PRAM then followed by PMU, now the Cooling Fan itself spins at FULL/Top Speed and I also noticed the Power LED Lite is now gone??!!
USB Mouse problem .... still persist and happened randomly but only limited to physical connected mouse only. Using ARD? No problem ... even the pointer already freeze and blinking but it still under control !
Good thing is, I am still able to use my Mini (Intel) .... its still working!!
Any clue?
Geez .. did I finally get a "Lemon?"
Or should I bring it to service centre for this 7.5 days old Mac Mini (Intel) !
( p.s. don't worry there are neither Refund or Exchange in my country ... :< ... only way is to go dealing with Apple Service Centre.)

just to continue...
i plug in the power cord and the fans go full before i touch the ON button. no front light, no boot chime, no hard drive noise (though the fans may drown it out), no video after many minutes, pressing the power button does nothing. About the only thing this mac does is plug in and fans on full. Unplug, fans off.
i held power in for ten seconds, i held power button for 5 seconds with power unplugged, i held power button in when plugging in power. Nothing.
I even reseated the ram.

Macbook May 2010 edition exhaust fan runs at full speed

Bought a new Macbook around February 2011. Yesterday all of a sudden while watching Netflix, the exhaust fan started running at full speed (Approximately 6200 RPM). I thought the machine was overheating. So I immediately shut it down and let it cool. But I noticed the machine was barely warm.
When I started it up again, it started making the same noise with the exhaust fan running at full speed. I installed SMCFanControl and I see that the CPU is barely warm - 35-37C and yet the fan is running at full speed. I looked at the CPU/HDD usage and there is barely ANY usage (~90% idle). Nothing out of the ordinary. So it definitely doesn't seem to be a heating issue.
In order to troubleshoot this I have done the following:
1. Installed latest upgrade - Snow Leopard 10.6.7
2. Reset SMC
3. Reset the PRAM
4. Tried booting from the install DVD. There as well it exhibits the same issue.
Neither of these steps have helped me with my situation. I would really hate to go to the apple store as its always crowded and would end up wasting time. Are there any other steps I could try?
Update: I tried running the Apple Hardware Test from the DVD. This is the error code that I got: 4SNS/1/40000001: TN1D- -1.000
Can someone please tell me what this means?

I don't know what that code means for sure, but it sounds like one of the temperature sensors may have died, so the fans just run at full to cool.
I would take it to the apple store.

Cooling fan just came on full speed

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