Mac Pro :: Fans Speed Up On Boot And Don't Stop - Machine Doesn't Get Past This Phase
Feb 8, 2012
Help! My internal fans speed up on boot (sounds like a jet engine!) and don't ever stop! My machine doesn't get past this phase, either. I have reset the SMC, and was cleaning the system for dust, etc, just before this situation occurred. After the cleaning, I was able to boot up fine. Then I had to re-open the machine and adjust something. I put the panel back on, rebooted, and the fans churned up like a Blackhawk helicopter, and didn't stop!  So, I unplugged the power supply, waited ten minutes, then reconnected the power supply and powered the machine on. The same result! The fans just don't stop. Â
Info:
Mac Pro, Mac OS X (10.4.11)
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Mar 27, 2009
Brand new 2009 octo, with the 2.2x ghz CPUs. Turn it on, start NO apps. Let it sit idle. Within a few minutes the fans ramp up to FULL jet engine speed. I can't hear people on the telephone. And never stop. Let me reiterate that I am running NO apps. My load averages are in the zeros.
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Jan 5, 2009
I was just wondering if it's okay to run the MacBook with the max fan speed (6200RPM) at all times? It's really hot nowadays and my MacBook runs at about 60 degrees Celsius idle. If I run a few CPU intensive apps, the temperature usually rises to 70-80 degrees. This is with the fan running at max speed. So what I want to ask is, will it be okay to keep the fans running at max speed at all times? I'm going to get a notebook cooler soon so that should help with lowering the temperatures a little lower.
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Apr 24, 2010
I find OS X's TTS engine on SL to be not fast enough on full speed. Is there a way to hack the plist file or something to speed up the dictation past the max speed?
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Jun 16, 2009
Does it hurt the computer... If the computer is doing something (watching flash, playing a game) that turns on the fan full speed;Does this hurt the computer? There are a few games I like to play and they turn on the fan at full speed (computer gets hot too, on the bottom.)
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Nov 4, 2010
I recently was given an old 2x1.8Ghz PPC G5 in order to build a personnal server but I have troubleshooting with CPU's temps that are really too hot (75?C with no app open, only Finder).
I know these temps are not that "hot" but I can't imagine what it would be when I'll open Safari, iGetter, iTunes, CyberDuck, Adium and Photoshop CS4...).
I first unmount everything, blown inside some bottled air to make sure there were no dust creating overheating inside and remount everything.
Installed Leopard (last OS installable on PPC machines), made the last updates possible and restart.
Everything is working well althought this CPU's temp is so damn high and fans's speed are still at 300rpm. I was looking for some app that would do the same as SmcFanControl for Intel based Macs but for PPC's ones.
After many internet searches on many forums I finally admitted there were no software able to set fans's speed, the only way was manually editing the AppleFan.kext integer's values.
WhatI did, reducing the integer values to lower rates (256x multiples), then restarted the Mac but nothing happens. As I check the changed values, they indeed are the ones I edited but the fans still are at 300 rpm and the CPU's temp 75?C...
Does somebody have any solution for that issue, I feel I checked everything that was possible but nothing seems to work.
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Jan 4, 2011
My PowerMac G5 fans hardly ever speed up. I mean they certainly never go full speed or ever close how they sometimes behave on start up. I never get the jet speed noise. Even when I am rendering a movie in FCP, I hardly hear the fans. Right now on idle, iStat pro reports CPU A being 58C and CPU B being 56C. Yet, the fans are still only 400RPM both CPUS Intake/Outake.
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Apr 8, 2012
My mid 2010 iMac i7 will not boot past the apple logo? I'm running 10.7.3. I have tried restoring from TM backup from recovery mode (worked the last time this happened) however upon completion it returns to the recovery screen? I made a disk of Lion when I downloaded the first time (followed same instructions sourced from numerous websites) which does not seem to work when i set to start up from this disk, just gets to the grey screen and flicks between the apple logo, a folder icon with a question mark and the circle with line through? Now I can't eject the disk either, a message appears that system can't eject and to make sure all applications are closed? Not sure how to go about closing these applications without being able to start the system? When I tried booting from the Macintosh HD I got a message that the boot cache partition was faulty? I have ran disk permissions etc all ok. Â
Info:
iMac, Mac OS X (10.7.3)
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Jun 11, 2007
I have an iBook G4 1.07 GHz 30 gb 256 RAM with Panther. It was working fine until my HD got close to being full. Now I can't get it to boot past the Apple screen. It will either freeze there, or move on to the blue screen and freeze before the progress bar enters. I want to re-install Panther but I can't get any CD to boot during startup by holding "C", including the Panther OS CD, the Hardware Test CD, or the Tech Tool CD. I am able to boot to single user mode, where I type fsck -fy, and I recieve no errors with the hardware. I had this issue beore and my HD had to be replaced by Apple.
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Jun 6, 2010
I love my MBP half to death but for the past few days my fans have been going non stop. They are currently at 4965 rpm doing just web browsing. Should I get this checked out?
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Sep 3, 2010
My step-son works for a company that uses a variety of computers in their test dept. and when they upgraded the test equipment they gave the old stuff to employees.My step-son is a dyed-in-the-wool PC guy who doesn't care for Macs so when he saw a G5 PPC sitting there he took it home and gave it to me.
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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Oct 9, 2010
My CPU heat sink fans always run above 2000 rpm. Is that avoidable?
Can I do something about that to drop the speed and get rid of the noise?
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Nov 4, 2010
I've got this weird problem with my late 07 SR 17'' MBP, after I plug in the Magsafe charger the fans start spining and in like 3 minutes they reach 6000 rpm (both of them) and stay that way until it's finishing the charge. I did the same exact tasks with my laptop charged and plugged in, and the fans stay around 2000 rpm, as opposed to when it's charging staying at full speed.
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Jul 29, 2008
During the summer, I don't have A/C in my house. My temps were getting pretty high, around 55C/130F for processors and up to 78c/172f for ram. That is pretty high, and I suspect it is because the ambient temp in my room is somewhere in the 90s. I am just very acclimated to the heat, and it doesn't bother me.
I downloaded SMC Fan control and bumped the min fan speeds up to:
1250rpm for Exhaust
1150rpm for CPU
800rpm for Power Supply
1350rpm for HD
This has made a tremendous difference. CPU is down over 20C and ram is down about 30-35C. Are these fan speeds safe? What are the Mac Pro fans rated at, and will the increased speed shorten their lifespan? I'd like to keep these current fan speeds if it is safe.
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Nov 16, 2008
I have a MacPro 2.66 quad-core intel. 4gb ram. I have a hard-drive from my old Powermac that i upgraded to 10.5.5 for this computer. Everytime I put my computer to sleep, and then wake it back up. The fans spin up to maximum speed and all the fans are running really loud and then after about a minute all spin to normal speed.
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Aug 22, 2009
I have a late 2007 macbook pro and recently the fans have been going at extremely high speeds without the MBP being hot at all. I have SMCFanControl and iStat Pro and both of them said my MBP's temperature was around 55C though the fans were going between 4000 and 6000 RPM, I also checked the activity monitor for high CPU usage but nothing high there. I turned my MBP off for 5 minutes with a fan blowing on it just incase it was hot but when I turned it back on the fans immediately jumped back up to 6000 RPM. They're back to normal now but I assume it will happen again. Anyone know what's wrong?
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Mar 17, 2012
My iMac (intel core duo) after a hard drive replacement seems to be running the fans at a high rate of speed. Usually just a few minuets after startup. Before the upgrade they were almost silent and now they are very noticeable. I need to get taken care of or just a result of installing a larget hard drive?Â
Info:
IMac Intel Core Duo, Mac OS X (10.4.10), Ipod 30 Gig, BMW IPod Integration, .mac
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May 18, 2012
Machine: iMac intel core 2Â 2.66Ghz Model A1224
sn# YM******ZE3Â
Ran the hardware test by pressing 'D' key. hardware test came back with error :4SN/1/40000000: T00P-65.250Â
I am guessing some sort of temp sensor might need replacing.Â
Info:
iMac
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Feb 16, 2009
If you are watching HD video, CBS.com HD shows for insteance.What speed are your fans running then and what temperature does your MBA Rev B have?
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Feb 28, 2009
I've got a little problem with my iMac 24" 2.8 GHz Nvidia Geforce 8800GS 500GB. When I start it up, the fans start blowing at full speed. I checked the apple support page for support and found my problem with all the symptoms being correct. The support said I had to reset the SMC by shutting down the iMac, then removing the power cord and all the other one's, wait 15 seconds and then put the power cord and the other one's in respectively. I did this almost 10 times, but my iMac still won't stop making those annoying noises. Maybe it has to do with the SMC fancontrol app my brother installed lately.
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Jun 25, 2010
My PCI bay fan is running at full speed no matter what. The temperature sensor reads correctly in OS X, so I don't think it's a bad sensor.
Is there any way to set the fan speed manually, say in openfirmware?
It's a 1.8 DP June '04; I've ran ASD 2.5.8 to calibrate and test the mobo, which passed.
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Mar 31, 2012
I've bought a brand new MPB 15'' about 2 days ago.Â
Every time I put it in sleep mode (by closing lid, or manually choose Sleep from menu) it goes to sleep (I check it by front indicator), but FANS STARTING TO ROTATE AT MAX SPEED (Sorry for CAPS)Â
I've already reseted the PRAM, reseted the SMC. Turn off any sharing. But that did not help.
Info:
MacBook Pro, Mac OS X (10.7.3)
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Apr 8, 2012
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?
Info:iMac, Mac OS X (10.5.8), 2.66 GHz Intel Core 2 Duo 4GB 1067
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Jun 20, 2014
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.
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Jul 31, 2009
For the last couple of days my fans have been going crazy, spinning at 6200RPM non stop. I installed fan control last month but the issues just started. When I open up fan control it says my fan should be spinning at 4000RPM. I had smcFanControl installed before and its still installed. My bluetooth module over heated yesterday so I used SMC to rev up the fans. I don't know if that is the issue because it isn't running now. I'll try uninstalling that now.
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Feb 15, 2010
I was wondering if anyone has had this problem or would be able to help me out.I've installed Windows 7 on my 2006 mac pro (mac pro is still in Leopard 10.5 and have'nt used any bootcamp drivers). Everything installed fine and seems to work ok but after about 30mins or so all the fans appear to shut down which can't be a good thing. Should I've installed it with Snow Leopard?
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Oct 2, 2006
I have a 1.8Ghz dual processor G5, 1GB Ram, 80GB HDD, with OS X 10.4.7 installed and all current updates, and today I was working on it and the fans on it slowly started speeding up, and then everything on the screen disappeared and a mesage appeared stating that a restart was required. After restarting everything seems to be working fine, but I'd like to know if this is a fluke or if I have a serious problem.
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Feb 8, 2007
I have a MacPro 2.66 quad-core intel. 4gb ram. I have a hard-drive from my old Powermac that i upgraded to 10.5.5 for this computer. Everytime I put my computer to sleep, and then wake it back up. The fans spin up to maximum speed and all the fans are running really loud and then after about a minute all spin to normal speed.
I don't have any other flaws except for this. Why could this be?
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Nov 5, 2009
I have a 24" mid-2009 iMac, bought in June. It's behaving oddly over the past week or so. It fails to wake on sleep on the first attempt, but always succeeds on the second. When I say fails though, I mean that it *does* wake up, but goes back to sleep again after a few seconds. The other issue happened today, when I woke it up, in a cold room, the fans started up at full speed (I assume). It sounded terrifying to me as my iMac has never got that loud - not even playing games. I restarted it and it was the same, but died down after a while.
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May 14, 2012
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 finechecked for crazy background tasks, there are none, CPU usage is at max 7%it does the same thing even in safe modereset PRAMreset SMCreinstalled OS X (Lion). Updated to 10.7.4searched 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.
Info:
MacBook
Pro, Mac OS X (10.7.4)
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