IMac overly loud fan

Why is my iMac suddenly making really loud noise like a loud fan blowing? Other than this, the iMac seems to be working fine.

afourm for iphones is this not imac pc lost you are. mmmm

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Imac 5 loud fan won't shutdown, unplug for 10 min plug in and fan runs high just when I unpluged it. power button usless

Imac 5 fan runs loud, nothing on moniter. Power button does nothing. Only thing plugged in r keyboard and mouse.
I unplug the unit, wait 5min plug in unit does nothing but loud fan noise. No Ideas?

afourm for iphones is this not imac pc lost you are. mmmm

Mid 2011 iMac 27 Loud Fan in Windows Only (HDD Replaced)

I bought a 27" iMac (Mid 2011) without a HDD online. Installed a spare 250GB I had laying around and I've been using it for a couple days, no issues. Today I installed Windows 7 x64 and noticed the fans are going crazy. I installed all the drivers and the computer was still pretty loud. I rebooted into Lion and it was fine.
I read online that the hard drive needs to be a genuine Apple hard drive for the temperature sensor to work. Is this true on this model? Also why is it only happening on Windows and not Lion?
Computers under warranty till 2014. Unfortunatly, I can't do anything without the original HDD. I'm trying to contact the guy to see if I can locate it but I haven't gotten a response yet.

Sorry to hear about your experience(s) - I'd suggest calling Apple and relating your experience; not all Apple stores actually do the work themselves. In my area, they actually have a contract with a third party service provider who does the actual work, so that could be the same thing with yours. In either case, it's not a really good track record, so I'd try calling Apple.

27in iMac very loud fan noise. 3hrs after setup and running the fan came on. Sounded like a jet taking off.

Brand new fathers day gift. The unit is cool to the touch. Air being blown out of bottom is cool. Shut down unit was what I found to get it to shut off. That worked. I get up this morning and wake computer from sleeping and immediately fan comes on. I'm thinking I should take it back. 2 days old but the amount of updating it needed to do it was prolly built months ago.

Tammy,
You can do a SMC reset. BTW the port on the bottom is the air intake, the exhaust is on the back on the upper left. However I'd recommend immediately contacting Apple Care. The machine should be OK right out of the box. You can find the contact information in your country at AppleCare Contact Info.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.

IMac G5 keeps freezing/crashing. SMU reset resulted in a loud fan noise.

I have a refubished iMac G5 OS X 10.6.8 desktop that was purchased in Aug, 2006. Recently it has been either freezing, shutting down completely, or the display will just shut off multiple times per day 20+ times/day. I am not interested in purchasing the $49 help from Apple. Is it time for a new computer?
I've been attempting some troubleshooting:
I have plenty of RAM- we installed more memory about 8 months ago.
Temperature running at 40 degrees C
I reset the SMU but now am hearing a loud fan sound and there is air blowing out of the horizontal vent in back of the desktop- which does not typically happen. The computer has not crashed since I reset the SMU 20 minutes ago. I'm worried about the noise.
Also, it has been really hot where I live, with a heat index of 110 today and I don't have air conditioning. Current indoor air temp is about 86 degrees F.
Also, I have been seeing thin horizontal stripes across my screen for the past few months, related or unrelated issue?
Thanks for the help!

Not that this will cure it but it may help:
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

IMac 27" (Late 2012) Loud Fan and Overheating Issues, causing Hard Drive Failure

Hi all,
I'm having some serious overheating issues with my new iMac. Any help to help me solve this problem would be gladly appreciated since it's really beginning to bug me. Here's what's has happened:
I noticed in the first few hours of switching the iMac on that there was a short burst of very loud fan noise. This has been happening about once every two days since and every time I haven't been doing any heavy processing with the system. I've noticed that the main fan will spin, on average, at 1200rpm. Is that normal? The iMac is very well ventilated and sits right next to a window...
I have also boot camped the iMac with a copy of Windows 8 so I could run some fairly power-hungry games. I intentionally purchased a high end iMac (27" display, Intel Core i7 3.4GHz, Nvidia GeForce 680MX Graphics, 1TB Fusion drive) and expected the iMac to run games flawlessly. However, after a few days, I noticed that the CPU and GPU had shot up to a worrying 80°C whenever I ran power-hungry games, with a very loud hissing noise from the fan. After running games for about 10 minutes, the fan will stop hissing, causing the GPU and CPU to increase to 100°C. The iMac then fails and switches off unexpectedly without any warning. After analysing the Windows event logs, I received an event ID 41: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
As this occurred about six times whilst I was testing my iMac's performance, I think my hard drive has now begun to fail - sometimes I will hear the hard drive make a click noise, about once every 5 seconds. Sometimes, the clicking noise causes OS X and Windows to run very slowly (even though minimal RAM is being used and nothing too intensive (Safari, Mail etc.) is being processed). Running Repair Disk and Repair Disk Permissions under OS X's recovery mode as well as a repair in chkdsk in Windows suggests that there were no problems with the hard drive. All I can do is wait a while for the clicking noise to stop, and then performance will increase. I have backed up everything externally.
I have also performed a reset of the SMC as well as the PRAM, which hasn't really helped.
Any help will be appreciated. I will gladly provide any extra logs etc. if they're needed.
Thanks so much,
Alex.

Alex Cummaudo wrote:
I've noticed that the main fan will spin, on average, at 1200rpm. Is that normal? The iMac is very well ventilated and sits right next to a window...
That's the default fan speed on iMacs, so there isn't any problem with this.
Alex Cummaudo wrote:
I have also boot camped the iMac with a copy of Windows 8 so I could run some fairly power-hungry games. I intentionally purchased a high end iMac (27" display, Intel Core i7 3.4GHz, Nvidia GeForce 680MX Graphics, 1TB Fusion drive) and expected the iMac to run games flawlessly. However, after a few days, I noticed that the CPU and GPU had shot up to a worrying 80°C whenever I ran power-hungry games, with a very loud hissing noise from the fan. After running games for about 10 minutes, the fan will stop hissing, causing the GPU and CPU to increase to 100°C. The iMac then fails and switches off unexpectedly without any warning. After analysing the Windows event logs, I received an event ID 41: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
You must know that Boot Camp isn't compatible with Windows 8 and that Apple hasn't released drivers for Windows 8, so it can fail. Install Windows 7 inmediately until Apple launches updated drivers.
As it looks like the hard disk is damaged, I would take the Mac to an Apple Store. It's in warranty, so it should be repaired for free or you should receive a new one

17" iMac G5 2GHz (ALS but no iSight) runs hot and LOUD fans

Hi all,
I love my iMac. I've had it for nearly 8 months now. From day 1, I've been surprised by how loud it is under any significant CPU load. Unfortunately for me, I have waited until I'm well out of my phone support window to do anything about it. I have not yet purchased AppleCare.
As I type this, my CPU temp is 70 degrees C and fan is running at 2600 RPM, running nothing beyond the browser in which I'm typing. Should I attempt to work in iMovie and render said work to DVD (the reason I bought the machine), CPU temp will climb to ~76 and fan speed jumps to 4600-4800 RPM. At this speed, the noise is unbearable...but it is annoying even when idle.
Can any of you with this model of 17" iMac comment on your experience? Do these numbers and this experience sound normal? I know I'm not alone in this complaint, but I can't tell how widespread the problem is or whether my machine is normal or defective. I've been told by my local service center (CompUSA) that every single 17" iMac of this revision runs hot and has loud fans, and that there is nothing I can do short of complaining to Apple in the hopes of getting a replacement of a later revision. I was told by a "genius" at a different Apple store that my machine sounded about like he'd expect.
I'm getting a system board replacement tomorrow, but have been told not to expect it to make a significant difference. I figure I must do it before Apple would consider further action.
Any advice at all will be greatly appreciated. Sorry for the long message...
Thanks,
ctcaldwell
iMac G5 17" Mac OS X (10.4.5)

Mine is still fairly new as I picked it up off ebay a couple weeks ago brand new. So I don't know when it was actually manufactured. The part of the noise that gets under my skin is that soft but constant background whining coming from the CPU fan. It doesn't really sound like anything rubbing or a bad bearing, just the sound that an electric motor makes. But, it just seems to resonate from the lower left hand side where the air intake is.
So quite accidentally one day I held my hand under the left hand side and it completely muffled the whine sound. You could still here the hum and the sound of air but the irritating element was gone. Playing around a little more, I opted to tape a business card under that lower left hand corner, bridging the gap from front to back to still allow an airspace for the fan's suction. It knocks out about 90% of the whine.
It's been running that way for two weeks with no ill effects. Yes, the fan speeds up and slows down when needed. Normal at rest RPM is 1500 and mid to upper 50's on the temp. The highest temp I've seen under max continuous load is 65 with the fan at 4000 rpm.
I did experiment with something longer than the business card but I did then see a decrease in cooling capability. The isight models have their suction ducted out the back and I bet that gets rid of that resonance.
So all in all it still makes less fan noise than my old B&W, it's just that the B&W wasn't up on the desk so close to our heads. But, If your fans are constantly on high, there is a procedure for resetting something in power management, I just can't find it right now. Hope this helps.

Loud fans in sleep mode 20" G5 iMac Rev A, OS 10.4.11 New Info

This is more of a confirmation and heads up on a problem I encountered and solved to see if any of you have other ideas.
Several weeks ago I replaced the power supply bought from Mac Pro Online in my G5 iMac. When I put it to sleep I hadn't noticed anything odd at first because I'ld just walk away until one day I could here the fans going full blast. The screen was off as usual but the sleep mode light wasn't on while the fans were running. I waited about a minute until the fans returned to normal speed and the sleep mode light returned to its usual behavior only it seemed to be a lot brighter.
I awoke the iMac from sleep and all was fine. I put it back to sleep and the screen shut off as usual but the sleep mode lights wouldn't turn on. I waited about a minute and listened to make sure that the iMac hadn't shut down and then the fans started up full blast for about 30 seconds and then returned to normal and the sleep mode lights turned back on.
I shut the iMac down, disconnected all USB and ethernet cables and reset SMU using the unplug power cord, 10 second wait, replug holding down rear start button. Fixed it!
Swapping out USB devices I narrowed it down to a Kingston USB Multi-sized port memory care reader hub-part number: FCR-HS219/1. I tested and got repeated results described above reconnecting it and downloading some images and ejecting. Loud fans in sleep mode happened again.
Tried a MobileMate Memory Card Reader, downloaded images, ejected and no problems with sleep mode.
My question is what could've messed up the Kingston Card Reader? It was working fine before the power supply replacement.
Thanks,
Tim

There's no telling.
Only cause that came to mind is a lightning hit last week that sounded very close by where all it did was cause the lights in my home to blink. The computer didn't. However, this might have fried the Kingston card reader.
To give an idea of the resilience of the former power supply, about a year and half ago I had the back off with the iMac sitting upright on a towel on the table while I played a YouTube video to see if I could cool this thing down. Instead of cooling it I overheated it by blocking the vents to where suddenly the iMac just shutdown. I could detect a strong smell of melted plastic from the power supply.
Put the iMac back on its stand and restarted without a hitch and I've never had any problems until several weeks ago when it just started shutting down for no reason. It passed the LED light test as it still does now with the new power supply.
This is the first Mac out of three I've had since 1998 that allowed me to see odd behavior like this. I had to rely on my 2000 Pismo G3 PB to find a replacement PSU online. That thing never breaks.

IMac from 2009. Suddenly making noise like a loud fan.

My IMac from 2009 is suddenly making noise like a very loud fan, or a little like a vacuum cleaner. The sound seems to becoming from the IMac, not my speakers. Could this be from any of the wires or connections plugged into it? Restarting the computer did not stop this. I think this happened once before a long time ago. Anything I can do?

Before I saw Mike Sombrio's post:
I restarted the IMac without unplugging the power cord, but the noise was still there when the IMac came back on. Then I repeated this about 10 minutes later, (restarting the computer without unplugging the power cord). This time the noise was no longer there. I don't know what's going on. I hope this problem does not return. Any explanations? Is this a sign that my IMac is having serious problems? Any advice?

Imac freezes on startup grey screen and really loud fans

My Imac G5 non intel 20" freezes on startup grey screen and really loud fans start and it won't boot. just have the logo on the grey screen.
I've tried resetting Pram - think that was the right thing to do?
I've tried disk utility, but it won't settle for me to choose the hard drive, it kind of sticks and keeps rotating the wheel.
any ideas anyone?
please help.

Lots of things you can try - first, try resetting the SMU. Next, boot from your install disc, go to Disk Utility and try to verify and repair your hard drive. If that doesn't work, try running the Apple Hardware Test on one of your install discs.
Also, depending on which model you have, you may be eligible for Apple's power supply or video and power issues.
Please post back with results,
Miriam

Very loud fan upon starting imac. Does anyone know how to fix?

My iMac has a VERY LOUD fan that turns on during start up and does not stoop. I tried to shut down and start up again. I also tried to unplug the machine overnight. Still happening.
Anyone have a solution?

This is a part of the larger MacBook Pro connectivity issue. There are several related threads dealing with the MBP's networking problems. If your unit is suffering from this type of difficulty, good luck ... (or a long ethernet cable)
(PS Everybody please make noise on this one so apple comes up with a solution.)
< Edited by Host >

Why is my imac (mid2011) doing a loud fan noise?

I had my imac since 2011 and never had a problem with it, until 1 month ago. It started to make a loud fan noise. I already reset the SMC, (http://support.apple.com/kb/HT3964) but I keep hearing it. Also checked in disc utility and everything is fine (not a disc problem).

I run Apple Hardware Test and gave me this:
4SNS/1/C0000008: TL0p-- 124
(during the test the imac went silent for a couple of seconds)

I turned on my new imac for the first time and it is making a loud fan noise please help

I just got a new computer and when I turned it on for the first time it started making a loud fan noise. the noise seems like it is coming from the back speaker. and it does not make the noise on sleep mode.

Connect the iPad to a USB 2.0 port your computer with the cable and iTunes should launch and it will take you through the process step by step.
I assume that your computer meets the requirements and that you have the latest version of iTunes on your computer.

My 2008 Macbook Pro makes a loud fan noise.

Hello -
I bought my 15" macbook pro back in October 2008. I was very happy with my purchase due to the machine's performance. But over the past year I have noticed an increase in the fan noise. It almost sounds like it's hitting against something at a very high speed, hense this irregular fan noise. The noise also increases drastically when I am working on Photoshop or InDesign. I also partitioned my hard-drive to hold windows so I can work on AutoCad.....noise increases also as I work on my machine.
Why is this happening? Could this loud fan noise damage any internal component to the machine? Should I bring it in to Apple immediately?
Thank you!

Some of the applications that you mention are somewhat CPU intensive which creates heat and results in fan speed increase and hence additional noise (to state the obvious). However if you are experiencing excessive noise when CPU loads are modest it could be that your fans are failing as all mechanical devices eventually will or you may have 'schmutz' inside that is the cause of the unwanted noise.
I suggest you open the MBP and see if there is any dust in the fans that may very well be affecting their performance. After 4 years, this is not an uncommon situation and it could be the solution to the problem.
If not, then you may consider getting replacements from iFixit or Powerbook Medic and replace them your self. It is not rocket science in this instance. If you suffer from chronic fingerfumbilitis, then have the Apple store do it for you.
Ciao.

Again imac 309rs/a fan noise

Hello!
problem with fans again
After hanging my imac - fan began to publish a crackling sound. that this could be?
few image's of istat
here look's like all right
and here:
imac didnt hanging again, but noise crash my mind
so what i try to do:
reset SMC (cmd+opt+r+s)
have on idea, about what i need to do now
or it's question for service? (actualy its very sad - imac work just around 4 months)

This could be a completely different issue, but occasionally I've encountered loud fan noise from my iMac. It's not a crackling sound, though, just a loud fan. Anyway, the fix for me is to unplug the power cord from the back of the computer then plug it in again. The fan noise disappears. Not sure this applies to your problem but it's worth a try.

IMac overly loud fan

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