CPU Fan running fast

Hey Guys!
I've some Problems with my IMAC 27" early 2011.
The CPU fan is running at about 3800 RPM even though, the sensors say, the CPU is pretty cold.
Here the Temps that iStat gives me:
HD: 41° C
CPU: 33° C
GPU: 43° C
MEM: 38° C
Optical: 38° C
CPU Usage: User 0-2 %, System 0%, Nice 0%, Idle: 98-100%
The problem occours some 10-15 minutes after I've switched on the IMAC and it stays, even if I restart the IMAC for at least 2 hours. Once the fan is returning to it's normal RPM (after 2 hours or more, mostly after being in Standby), i can work for several days and it doesn't return, unless the IMAC is switched off and on again. I think, the IMAC slows down, when it has this problem. Especially scrolling in Safari is extremely slow then. Sometimes it even stops!
Things I tried to correct this:
SMC-Reset --> Didn't succeed.
Start in 'Safe Mode' --> Well it's running in save mode right now and sounds like a vacuum-cleaner.
Disconnect all externals --> Nothing
Deactivate Time-Machine --> Nothing
P-Ram-Reset (?) --> Nothing
New User Account --> Nothing
I think the problem first started to be there some days after installing Lion. By the way: My MBP 15" Late 2008 runs great with the same stuff on it.
Anybody got any ideas?
Thanks a lot & greetings from Germany!!!

I've got the opposite problem, my AMD CPU is running around 55C and the fan hardly ever exceeds 1200 rpm most of the time its running around 950rpm. I think the 48C to 65C is running on the edge of to hot in my opinion, I like to stay around 35C-40C. Motherboard, video card and hard drive all stay in the 30C range. I tried to speed the fan up with SpeedFan program but it can not interface.
I hope someone can give us a answer, I checked the UEFI and could not find any setting allowing controlling fan speeds on my ENVY 700-200z/AMD A10 cpu.

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24" iMac summer 2008. CPU fan runs at highest speed, some times goes to "sleep" mode. t' is about 35'- 42'C. Run hardware test: 4sns/1/40000000:tlop-130.000, next time 4sns/1/40000000:tlop-128.000 errors. Reinstalled all softwere. Nothing changed.

24" iMac summer 2008. CPU fan runs at highest speed, some times goes to "sleep" mode. CPU t' is about 35'- 42'C. Run hardware test: 4sns/1/40000000:tlop-130.000, next time 4sns/1/40000000:tlop-128.000 errors. Tried SMC, NVRAM, PRAM. Reinstalled all softwere. Nothing changed.

I suspect you have hardware problem with a fan sensor. Doing a software install will not help the machine needs to be taken in for service. If you run Apple Hardware Test in Extended Mode it should reveal the error code. If it does not then run AHT an additional 2-3 times to be sure in Extended Mode. Each pass will take about 30-60 minutes.

Satellite C55-A - after BIOS update cooling fan runs faster

Hello,
I was informed by Toshiba application that new BIOS version is available I confirmed it and BIOS was updated. Now I have problem. Cooling fan runs faster than before and it is very annoying.
Can I find older BIOS version somewhere and roll it back? I don't need it if it doesn't work properly.
Now I have version 1.40. Is there some solution for this new version?
Message was edited: posting has been translated

Toshiba EU driver page provides only the latest BIOS version.
Furthermore the BIOS downgrade isnt possible using the win-bases BIOS update.
In order to downgrade the BIOS on Toshiba unit, you will need to use the traditional BIOS update method which requires special BIOS version. This is available only for authorized service provider.
At the other hand there must be an serious reason why the cooling module run faster.
Maybe the cooling method has been improved in new BIOS just to ensure that internal parts would be cooled down properly.
Its just an assumption but I think it makes sense
By the way: after each BIOS update, you should load the BIOS default settings and should save the changes. If you havent done this in the past, do it

CPU fan running full speed after 15 minutes

My 3 month old iMac 24" has just started having fan problems.
Before I went away on a training course, it was working fine. Left it switched off at the outlet for 3 days, now the CPU fan runs full speed after the iMac has been switched on for 15 to 20 minutes.
CPU temp is 24C, CPU heatsink is 28C. Ambient is 17C. CPU fan is 3600rpm. Other fans are normal.
CPU usage is less that 10%. Only Safari is running.
I've tried resetting the SMC - left all plugs disconnected for 15 minutes, reconnected mains power for 15 minutes, reconnected USB, then switched on.
Still the same - OK for 15 minutes, then CPU fan runs full speed.
Anything else that I can try?

I tried again, following your instructions exactly. It seemed to work, running normally for about an hour.
I left all the USB devices unplugged, except for the keyboard and mouse.
I then shut the iMac down, but left the mains power turned on at the wall. When I switched it on again 2 hours later, all was OK for 15 minutes, then the CPU fan ran at full speed.
Shutting down for a few seconds fixes it for another 15 minutes.
I'm wondering if it's a software problem, although I haven't loaded any apps recently, apart from a few monitoring programs since this problem appeared.
Last night I left it running the extended hardware test for a couple of hours, and the fans were fine.
One thing that I noticed yesterday was that the "GPU" temperature readings in iStat were all missing (just "-" displayed) for a couple of seconds when I clicked on Dashboard. Is there a way to keep iStat open while I'm using the iMac?
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G4 Wont Start Up No chime and fan runs fast.

Hi Mac Users,
I am at my wits end! My Mac won't start up.When I switch it on there is no chime and the fan runs fast.
I have checked the battery and it is OK.
Tried the reset button and no joy.
I have reseated the ram memory still no improvement.
I am completely lost without my computer would some kind soul point me in the right direection?
It is the hub of my recording studio and my life cos I'm disabled.
I have read a lots of posts on here and I feel I am getting confused with too much information.
My names not Dan but I am desperate?...........Dylan.

The red LED indicates power to the logic board, which is good.
Try Resetting the Logic Board
Resetting the logic board can resolve many system problems. Whenever you have a
unit that fails to power up, you should follow this procedure
before replacing any modules.
1 Unplug the computer.
2 Press the Power On button on the front of the unit.
3 Open the side access panel.
4 Remove the battery from the logic board.
5 Wait at least 10 minutes before replacing the battery.
6 Make sure the battery is installed in the correct +/-
direction.
7 Reassemble the computer and test the unit.
Note:
This procedure resets the computer’s PRAM. Be sure to
check the computer’s time/date and other system parameter settings
Will your Mac boot using the Tiger install DVD (or another system CD/DVD)?
Will it boot in Safe Mode? See
What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392
Look at this link.
*Resolve startup issues and perform disk maintenance with Disk Utility and fsck*
http://docs.info.apple.com/article.html?artnum=106214
 Cheers, Tom

Iavd is 98%, computer gets real hot, fans running fast

Hello,
I see from some posts of last year, unresolved, I guess, that iavd (anti-virus?) is
very high for no good reason, meaning it's taking lots of processor (space? function?) and the computer gets hot and the fans run fast.
Mine has been doing that for a long time.
Does Apple know what causes this?
A fix might help lower my electric bill.
Thank you.

Not to mention computer wear and tear. I think it is the nature of the beast though, as all antivirus programs can have a tendency to cause a shorter life expectancy on a hard drive and other parts of the system. I skip the AV altogether on mine, and simply choose to browse carefully and stay away from filesharing apps and the like.
Flops
<Edited by Host>

New HD fans running fast

Installed new HD same as original but larger and fans running fast and noisy. imac 21.5 inch mid-2010

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Fans running fast

OK. When I install the 10.5.8 combo updater and restart the Mac it closes down as far as the screen goes blank, but then the fans start running slow at first but after about 2 minuets they are running as fast as possible, should I leave them running? I have left them in the past for up to 2 hours but then I decided to push the button to force quit, just how long should I leave them running? And is this normal?
Thanks

That is a retail upgrade to a new system; not a gratis update within one.
The ownership & use of a retail 10.5 Leopard DVD installer disc set is required.
A disc from another computer won't work in a different one, so that's out, too.
+In your post's signature line, you say the G5 shown is running 10.5.8; if so+
+do you have another computer now, with 10.4.11 installed? Or was the issue+
+you had mentioned, due to attempting to run the Leopard 10.5.8 update step+
+in a Tiger 10.4.11 system? Usually, those kinds of things never get very far.+
(If you know someone who has upgraded to Snow Leopard 10.6, & has
no further need for their old 10.5 installer disc set, they may make a deal.)
Sadly, the normal retail sources for buying a new/unused Leopard 10.5 disc
set won't have them; so other options and sources have to be examined or
researched. One possible source may be to call the main Apple phone number
for the sales support (see web page) at 1-800-MY-APPLE and ask for a Mac
OS X 10.5 specialist; and inquire about the purchase of the Leopard 10.5 full
install disc set, which is essentially the retail disc for a complete installation.
+In regions outside of North America, you may have to contact your nearest+
+Apple main sale support & inquire about getting the Leopard OS X 10.5 discs.+
The best way to upgrade to Leopard 10.5.8 is to have a separate hard disk drive
(if you have a tower computer) for it, all alone; no old Tiger or other OS X parts.
And if you use iLife, get a later version of that suitable for the hardware in your
computer; as not all older Macs can support the latest iLife. Some may prefer to
be using iLife 06 or 08, if they don't have all the newer stuff. Older ones may be
better with an even older version. Since iTunes is a separate download item, that
may also be too much for some ancient computers. Of course, newer iPads and
other items probably need to get into the iTunes store and interface with the Mac.
Those would require the minimums as indicated by their system requirements list.
If you are on the lookout ahead of time, getting a clean no longer in use Leopard
DVD retail installer disc may be a matter of timing and luck, in your vicinity. A few
weeks ago, a craigslist ad had some Apple OS X software including the 10.5 DVD,
in the box with book; an iLife 08 in box with instructions, Garageband jam-pack, a
white Apple usb keyboard, and iWorks 05 in the box with paperwork; all for $50.
And someone else, a few years ago, gave me an early retail Leopard 10.5 DVD.
So, I could easily upgrade one of my Macs (again) to Leopard 10.5.8 and have no
old Tiger system parts inside the computer at all. - A clean break, as I'd done before.
Be sure your computer has better than minimum hardware requirements to run
Leopard 10.5.8, including more than enough RAM, large capacity hard disk drive
with large cache and good read/write speed; and a good Superdrive optical drive.
If the issue with the 'fans running fast' has been resolved, or is conditional, you
could add whatever new info you have in this thread. And if you are considering
an upgrade to Leopard 10.5.8, issues outside of the actual computer hardware
seem to appear in the Leopard discussion page, if you needed to start a thread.
Sometimes, getting the dust and other debris out of a computer so it can breathe
and get adequate air-flow, can help it run cooler. But sometimes, there are other
possible reasons why, if it is running too warm, for it to be doing that. Do you have
and use a Temperature Monitor software that an be read in the main menu bar?
A temp widget is mostly pointless, since in order for that to work, you have to stop
most everything else & run DashBoard. That can further load the system, to make
it run warmer; if the issue of heat and fans remains an issue to be watchful over.
Hopefully a few of your questions or curiosities are finding answers; at times, a
fair gamble on information can be a google search. If worded adequately.
Good luck & happy computing!

Fans running fast on mac pro

This quesiton has been brought up many times before, and I've tried the suggestions everyone has offered in resloving the problem of fans running fast on a Mac Pro. In my case they started running fast after Sleep, Restart or after Startup. I have a 2007 Mac Pro and have reset the PRAM and SMC in the past and these, along with updates from Apple, seem to have resovled the problem. Recently, however, I began to have this trouble again and went throught the motions of resetting PRAM and SMC. I even reinstalled my OS Lion to see if that would resolve the issue, but to no avail. So this is why I am writing. In an effort to give someone else a heads up to a new problem I incurred that hasn't been brought up in any discussions on the subject to this point; that I can find, anyway.
About 8 months ago I had one stick of Ram blow on me. I sent it back to OWC and it was replaced no problem. Then I noticed a month ago that all the RAM on my lower riser, except the replacement stick, had blown. Again, all were replaced and this is when the fan issue arose. I tested the RAM on the Upper Riser in the lower slot and they worked. I put the Ram from the Upper Riser on the Lower Riser Board to make sure it worked, and they did. I did this, however, after thinking I had blown the Lower Riser Board and ordered a replacement...glad I did. I now had 8 sticks of Ram in the Upper and Lower Riser all working well, but had a computer that sounded like a 744 just before take off. After numerous attemptst to fix the problem and searching long on the internet I decided to try the New Riser Board I had bought. It workded. That Lower Riser Board, for what ever reason, must be foul somewhere/somehow. I now longer have the problem.
So, I suggest you follow all the advice of those who have written before me because their suggestions worked initially. However, if you've had blown RAM recently, or maybe are about to and this is an indicator you have a Riser Board problem, you just may want to check your Riser's one at a time in both slots to see if the fans run fast while Board is in and the other is not.

I would - in today's world with SQL-injection hitting everything from "mom and pop" to govt and university sites and everyone in-between, to look at how well Vista handles malware.
I feel much more secure with Firefox 3 with the NoScript extension and disabling javascript on most sites.
There are a few new (last week) security vulnerabilities in Safari for Windows still.
http://www.makeuseof.com/tag/best-programs-to-keep-your-computer-secure/

XServe fans running fast and loud

Good morning
I have searched the information base and tried a few suggestions without success. Hoping for another solution here.
I have an Intel based XServe (2008) (OS 10.6.8) whose fans are running faster (and therefore louder) than they have previously. This follows on the heels of a power outage (two of them actually) here at school, though the server is behind a UPS. The system identifier light is also blinking in a particular pattern - 4 flashes and a pause repeating.
The server is up and running, teachers are connecting to it just fine, the RAID is intact and online, the drives all look good according to Disk Utility. So, functionally, everything looks OK - the fans are just running faster and louder than before - noticibly louder than the other Intel XServe in the rack. The server is at the top of the enclosed rack with a space below it as it has been for the last 4 years.
This summer I took all the XServes out of the rack, opened them up, and blew the dust out of them (including a moth - truly a bug in the system), so the all the airways are clean and clear.
I have tried the suggestions I could find on this forum:
     restarted a bunch of times
     shut down and disconnect everything (including power) for a period of time
     reset the PMU/SMC or whatever it is called doing the front panel buttons with the blue lights on the lower row
     reset the PMU/SMC or whatever it is called by holding down the power button while disconnected from power
I have installed iStat Pro and the temperatures are averaging around mid- to upper- 30°C and the fans are running around 3000 RPM . The temperatures aren't signifcantly different that the other XServe, but the fans are running about twice the speed.
I had to reformat the RAID earlier this weekend and copy over the data files from backup and reassign permissions, but the server was running quietly after that was all finished. It seems to be post-powerbump that the fans became noisy.
Sorry for the long post, but I tried to include all the pertinent information. I would have tossed in photos and videos if I could have!
Any suggestions would be appreciated.
TIA
Greg

Did a little more searching about setting up LOM on the XServe and I think I have it figured out now.
I assigned a unique (different) IP address to Network 1 in the LOM dialogue box in Configure Server menu of Server Monitor since I only have Ethernet 1 enabled and linked to a switch using a unique (different) IP address for network traffic between the XServe and my clients.
I can now see (via Server Monitor remotely) that I have a dead blower in my fan array which, upon closer inspection, is also evident in the iStatPro display (one fan running at 18 RPM). Hence the blinking system identifier light and the other fans running faster and harder (and noisier).
Oddly enough, I have a replacement fan array in a box of XServe spare parts. I now have a weekend task.
Thanks for all the information to be found and the people participating in this forum. Love it.
Greg

CPU Fan running really fast even at low temperature.

I bought a HP Envy 700-160eo desktop computer 5 or 6 months ago and for the last 2 months the CPU fan has been running really fast even at low temperature. It's like locked to about 2400RPM as soon as I boot up my PC. Even if I get 30 degrees celcius it runs at 2600RPM. I've tried resetting my CMOS and tried updating my BIOS, but the BIOS update that you are providing me on the HP Envy 700-160eo driver & update section isn't compatible with my PC. The update is for 700-0xx. I've been using the program called Argus Monitor for controlling my fan speed.

I've got the opposite problem, my AMD CPU is running around 55C and the fan hardly ever exceeds 1200 rpm most of the time its running around 950rpm. I think the 48C to 65C is running on the edge of to hot in my opinion, I like to stay around 35C-40C. Motherboard, video card and hard drive all stay in the 30C range. I tried to speed the fan up with SpeedFan program but it can not interface.
I hope someone can give us a answer, I checked the UEFI and could not find any setting allowing controlling fan speeds on my ENVY 700-200z/AMD A10 cpu.

Macbook pro fan running fast and high cpu usage

The fan has started running all the time the error code is 4SNS/40000000 VPOR-19.763

Hey emilyiow,
Thanks for the question. I understand that you are experiencing issues with your MacBook Pro in relation to the fans. Sometimes, this symptom can indicate that the SMC needs to be reset. For more information and instructions on how to do so, check out this resource:
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
http://support.apple.com/en-us/ht3964
After performing normal troubleshooting, these symptoms may indicate that an SMC reset could be necessary.
Fans
- The computer's fans run at high speed although the computer is not experiencing heavy usage and is properly ventilated.
Additional information:
Using Apple Hardware Test - Apple Support
http://support.apple.com/en-us/HT201257
What to do if you get an error in AHT
Confirm that the power adapter is connected if you're using a Mac notebook.
Confirm that all external devices are disconnected from your computer.
Record any error code given so that you can give the information to a Mac Genius, Apple Authorized Service Provider, or Apple Technical Support Specialist.
Thanks,
Matt M.

Edge 130 overheats and shuts down, but CPU fan runs at low speed

Hi! I am having a problem with my Edge E130, running un Windows 8.1 64-bit. When running under high load the laptop will at times overheat so much that the system does a hard shutdown - it simply powers off. I installed Speedfan - it shows the CPU at above 90 degrees celsius. The weird thing is that the CPU fan is not running at full speed. I do not know why. Is there a way to fix this? The fan should at least run at full speed. Thanks in advance!

Thank you for the reply! I can't seem to find a black and white sticker. There is a sticker which is black with light grey text. Is it one of these two numbers? label P/N 0B07208CT1 label P/N 0B95210 I am not using any fan control software. Also, my BIOS version is the latest available from Lenovos support site. (when I update the BIOS last time, the fan was running at very high RPMs for a while during the install. So it seems it would be possible for it to run faster)

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Hi There,
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regards,

Hi Yassine
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Click on the current power plant and check the Change Advanced power settings.
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Maybe this FAQ could be interesting for you:
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When you were checking Activity Monitor, did you select "All Processes" from the drop down list at the top

CPU Fan running fast

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