Fans at High Speed

I am currently transferring files from my G5 to my new 24". The fans on my G5 are whirring at a very high speed. Is this normal? If it takes a while for the transfer, I'm afraid the fans will burn out or something.

Its normal for them to rev up if there is alot of heat. Its not normal to just be really loud for no reason
Its possible that resetting the PRAM and PMU would resolve it it keeps happening after the transfer.

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MBP 2006, Crash during login, black screen, fans running high speed.

Hello.
I'm having problem with my MacBook Pro 2006 model. OSX 10.6.8.
When I boot into OSX and log in then the computer crashes with black screen and fan start running on high speed. It usually happends when I'm typing my password but sometimes I can log in but then it crashes usually soon.
I can boot into Safe mode and Single user mode and everything is normal there.
If I boot from OSX install CD same happens. Its crashes. Same with from Install USB stick and from Disk warrior disk. Safemode and sigleuser mode is no problem.
It started one year ago when I puted the computer to sleep and woke it up. Then it crashed. So I just stopped puting it to sleep. Then after few months it started doing this during login but after one or two restarts then it worked. And now she does it every time.
Nothing in logs that gets my attention. I've tryed resetting SMC and everything else I can reset.
Anyone had this problem ?
Best Regards.
Sverrir

I've been having this same frustrating problem, with the same machine (A1150, 1.83Ghz) although mine does it with both the AC and the battery. I was hoping it was the battery and just replaced it (the old one was almost dead), to no avail.
I thought it was working okay in Windows under Bootcamp until one day it decided to show off the same black-out/wild spinning fans symptoms. Grrr.
I've since run the following repeatedly, all of which have come up with nothing: AHT, Memtest, Hardware Monitor, iStat. I've been furiously monitoring the logs and not seeing anything jump out. I also cleaned the caches with Leopard Cache Cleaner and OnyX, and did an archive & install of the OS a couple of times. Lastly, I created a new user to see if there were problems with my start-up. Problems persisted.
Right now the only time I can keep it running is if I'm in Safe Mode. Not helpful, particularly WRT making a backup (i.e., I won't be able to use Firewire ).
Any more ideas/advice on this would be very appreciated. I'm ready to hurl my puter out the window.
Message was edited by: lynnbee
Message was edited by: lynnbee
Message was edited by: lynnbee

Desktop loads, then unit freezes with fans on high speed

I've read through the other posts, but this problem seems different enough to this newbie that I started a new question. Thanks for any wisdom/help you can pass along.
The unit had been working normally (if a little slower) until this weekend when it started doing the following each time I attempted to start up:
1) All start up proceeds as normal
2) I log into my account
3) Shortly after my desktop loads, the cursor freezes and the fans begin running at high speed
4) I hold the power button and the unit shuts down
I've tried this three or four times since and the cycle repeats itself each time, never allowing me to get beyond the loading of my desktop.

The are a couple of things to try. First, make sure tha there is no dust clogging your vents. Second, reset the SMU:
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.
Third, reset the PRAM.
If none of these works, try using Disk Utility:
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
Then, when you are booted from your internal, Repair Permissions from your internal drive.
Please post back with results,

CPU fan at high speed due to power supply sensor

The CPU fan on my Imac runs at 3900 RPM. Apple hardware test provides an error code of 4 SNS/1/40000000:TpOP-131.000 which is the temperature sensor on the power supply. I opened the Imac and the single wire to the power supply is connected securely. At this point, the problem could be in the sensor wire ( which disappears into the wiring harness), the power supply sensor - which I assume is built into the power supply, or in the the logic board where the temperature information is processed. I have tried the SMC and PRAM resets with no results. The wiring harness is very difficult to replace, and the power supply is relatively expensive, so I would appreciate it if anyone who has solved this problem could tell me what the solution was. I would really like to repair the Imac and eliminate the loud fan noise.

Hi ee36,
Thanks for your response. I have performed the SMC reset you described many times with no positive results.
The apple repair manual for my Imac says to replace the wiring harness if you have this problem. A daunting procedure for me since you have to almost completely disassemble the Imac. It seems that if the sensor is disconnected (open circuit) the associated fan (CPU fan in this case) will always run at high speed. It seems to me that several failure modes would create this open circuit, and I was hoping that someone could identify how their Imac was fixed so I could hopefully determine the most likely effective repair. I have created an applescript program which I have set up to limit the cpu fan to 1500 RPM and limit the noise, but I would really like to have the security of knowing that the fan could respond to elevated temperatures if necessary. Thanks again.

Fans at high speed even when idle

The fans on my iMac have been running at high speed all the time for a few weeks. I don't know why: I've installed no new software except for system updates. The fans used to be almost silent.
XResourceGraph records the CPU temperature in the high 60s (Celsius) and CPU fan speeds of 5500-6000. The fan speed stays around here most of the time (regardless of how many applications are running - even if I'm running none at all!), and never drops below about 3500.
I've tried:
a) resetting SMU
b) resetting the PRAM
c) vacuuming the inside of the iMac
... all to no avail. Any further suggestions please?
Thanks in advance!
iMac G5 Rev B Mac OS X (10.4.9)

System updates can cause problems like yours, since you have done the most obvious things, I would suggest reapplying the latest update as a 10.4.9 combo updater. Please let us know if that helped,
Miriam

Macbook Pro Fans at high speed

My macbook pro has been running at high speeds, non-stop, for a few days now. I tried resetting the SMC, but that did not work. Any suggestions?
Thanks!

Reset the SMC
Intel-based Macs: Resetting the System Management Controller (SMC)
Repair the HD via disk utility
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

Macbook Pro 13" early-2011 Fans at high speed

Hi guys,
I hope you can solve this pussle for me.
My Macbook Pro (13", early 2011, Core i5 @ 2.3) started to behave weird, its fan (only the exhaust one, since it's a 13" Macbook Pro with the Intel HD integrated graphics) is running at top speed (6200-6208 rpms) with no reason at all. No system processes consuming high CPU, just idling.
There's a twist to this issue, though. It only does it when I open the lid more than 90 degrees. If I get it back the fan returns to normal functioning.
What I did:
checked the temperature sensor values, they are fine
checked for crazy background tasks, there are none, CPU usage is at max 7%
it does the same thing even in safe mode
reset PRAM
reset SMC
reinstalled OS X (Lion). Updated to 10.7.4
searched every discussion I could find on this matter
The difference between this issue and others I encountered along the way is the lid opening thing.
Does anyone know if getting the lid past the 90 degree mark triggers anything?
The other theory I have is that there's some dust blocking the intake and when the lid is opened wide, the air is somewhat obstructed by the bottom of it.
Any help is much appreciated.
Thanks!

You may have diagnosed the problem.
(The other theory I have is that there's some dust blocking the intake and when the lid is opened wide, the air is somewhat obstructed by the bottom of it.)
I would take off the bottom cover and see if there is any offending material. If not, then the Apple store genius bar should be your next destination.
Ciao.

Blank Screen and Fan on High Speed all the time

We have a TouchSmart PC 300-1000z (Aw021AV#aba) Windows 7 Home 64bit.
This morning the screen was blank and the CPU fan was stuck on high. It will not throttle down at all. We have to press and hold the power button to get the machine to power down.
I can't see anything on the screen so I can trouble shoot it. I did remove the back panels and so forth to dust it with a can of compressed air.
Any thoughts on this?
Thanks.

Hello IDSwagman,
When you boot the computer is the screen completely black or do you see the boot logo screen show up and then the screen go black?
This HP troubleshooting article addresses the issue you are experiencing. The steps you take will depend on if the screen ever shows anything at all or it is always completely blank.
http://goo.gl/LAo04
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.
- Friendship is magical.

Mac running slow and fan running at high speed

MacPro1,1, osx 10.7.5, 8gb ram
My mac is running slow and fan running at high speed & very loud. On MRI diagnostic it passes everything except this error "CPU Proximity: Can't Read ". I did low level configuration and still having issue with unit.

See Below.
Mac running slow and fan running at high speed

Mac OSX 10.6.8 Garage Band '11. This error happens occasionally : I am forced to power-off-on. Pop-up states that error info will be sent to apple. I never hear back from apple. Second prob: Fan sometimes comes on, runs high speed, then slowly stops.

Garage Band '11: pop-up error forces me to power off-on. Message states that info will be sent to Apple.
I never hear back from anyone about this.
Second prob: Fan sometimes comes on, runs high speed, then slowly runs down and stops running.

First thing to do is a SMC Reset, you can find instructions at:
http://support.apple.com/kb/HT3964
READ THE INSTRUCTIONS CAREFULLY!!!!
Then try Repairing Disk Permissions, do this at least 2x. You will find this in Disk Utility which is located in Applications - Utilities - Disk Utility.
Finally you may need to uninstall Garage Band and reinstall. You may have to use Pacifist to do this, you can find it at:
http://www.macupdate.com/app/mac/6812/pacifist

Battery gets very hot during use and doesn't last long, fan runs at high speed, computer won't shut down

Macbook Air isn't a year old and I don't leave it plugged in ever. The battery might last 2 hours and gets very hot. In addition the fan runs at a very high speed. The computer won't shut down in a normal way. I have to hold the power button down to shut it off. Can someone suggest something please.
Thanks.

Runaway applications can shorten battery runtime

Why does my fan go into high speed noisy mode sometimes when I'm not actually doing anything on my laptop?

why does my fan go into high speed noisy mode sometimes when I'm not actually doing anything on my laptop?

Probably Spotlight is indexing your HD? To stop this indexing, have a look here:
http://www.thexlab.com/faqs/stopspotlightindex.html
marek

Early 2008 MacBookPro keyboard backlight off and fans run at high speed

Hi!
I wrote from Turkey.
My Early 2008 MacBookPro 2.40 ghz 4 gb Ram OSX Mavericks machine's keyboard backlight off and fans run at high speed; it seems an exact smc resetting problem.
So i tried the 2 ways of SMC restting procedure; both battery you can move and not, but nothings changed on the situation..
On the way for removable battery; nothing changed but on the way for umremovable battery way; keyboard backlight flashes and gone, but fans are at high speed not changed. So nothing changed.
What can i do right now? i'll wait for your advices
Thanks

Your Mac may need a new PRAM battery. Once it is over 4 years old, that often is needed.

HT201295 Late 2009 Intel iMac Needs Frequent SMC reset - constant high speed running fan

Late 2009 Intel iMac is having reoccurring episodes of high speed fan running, especially after waking it up. The SMC reset by unplug and reboot works, but I worry that this is a serious sign and that the machine is slowly dying. Any thoughts? Works fine otherwise.

wolfgang272 wrote:
Do you have any ideas?
Yes, you just need to reset the SMC and you should be fine
https://support.apple.com/kb/HT3964
Whoops you already did that.
Hardware Test then
https://support.apple.com/kb/ht1509
Read more info here
https://discussions.apple.com/message/16276201#16276201

Every 8 days when in sleep mode my fan runs up to high speed. Have to shut down to stop it. Tried SMC reset no use. Even powered down for a day when speed up was due, 8 days later ran up to high speed when asleep. How do I fix this

I was previous running Lion but upgraded a week ago the Mavericks but the fault it still there. Nearly always happens in middle of the night as when I get up in the morning fan is running at high speed.

Try the troubleshooting steps using the Test Account. The theory is if the Test Account works OK then you know you have an issue with your standard user account. If the problem persists with the Test Account then you know it's a global issue and can begin eliminating items. I would start by eliminating non essential peripherals such as printers, time machine etc. You may find you have a problem with one of those or some app or some setting.

Fans at High Speed

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