Fan really loud

My son's imac has been shutting down on its own and not wanting to start up. Then it'll start up by itself and the fan is really loud. I followed the steps to reset the SMU but it didn't help. (turned off computer, removed all cables, including power cord.... waited 10 seconds, held in power button and put in power cord at the same time) I don't have the extra warranty protection right now, because the lack of funds won't allow right now. I'm planning on purchasing it in a couple weeks. Anybody got any suggestions? HELP!
tashby40

Welcome to Discussions - Apple Care has to be bought within one year of the original date of purchase, so you had better do it before then. If you have a G5 iMac, it sounds as if your power supply unit is faulty, see if you qualify for one of Apple's Repair extension programs.

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I came home from school today and left my backpack in my car which had my MBA in it to talk to my neighbour for a bit. It's approximately -22 Celsius where I live right now. When I came inside, I woke up it up, as it was previously sleeping, and it's fan (or at least that's what I think it is) was really loud. Ever since I got it, I haven't heard the fan once, and I was horrified when I heard it, so I quickly turned it off. I later found out that I have to let it warm up to room temperature before turning it on. It's been about 2 hours now and I just tried to turn it on again, and I'm still hearing the fan. What should I do? I'm worried because I don't want to harm my MBA, but I also need to use it to work.

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you risk condensation forming inside a rapid warming macbook as the fan shuttles WARM air in the room over the COLD logic board
its not the fan you should worry about, its doing that and causing condensation and corrosion to form from quick temp. fluctuations inside the cold macbook.
DONT do that again, it leads to corrosion.
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A: you notice it more in a quiet room (the typical case) which is normal, all is AOK
B: fuzz and dust has caked onto the blades causing the fan hub to get off balance and make a buzzing sound.
C: fan rotor is going bad and making a whirring or buzz noise (rare).
D: Fan is spinning up due to excess heat from gaming, heavy graphics (typical, all is OK)
A and D are normal
B and C are not.

Issue: bootcamp gaming fan really loud

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leonhart1981,
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Fan really loud gaming

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My fan has been running really loudly for a day now. I have tried turning it off and on again, putting it to sleep, cleaning out the dust.
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Last login: Mon May 14 08:18:19 on console
Ninas-MacBook-Pro:~ ninasingh$ kextstat -kl | awk ' !/apple/ { print $6 $7 } '
Ninas-MacBook-Pro:~ ninasingh$ sudo launchctl list | sed 1d | awk ' !/0x|apple|com\.vix|edu\.|org\./ { print $3 } '
WARNING: Improper use of the sudo command could lead to data loss
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jp.co.canon.CUPSCAPT.BackGrounder
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AEProfiling.framework
AERegistration.framework
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AdobePDFViewer.plugin
Flash Player.plugin
JavaAppletPlugin.plugin
Quartz Composer.webplugin
QuickTime Plugin.plugin
SharePointBrowserPlugin.plugin
SharePointWebKitPlugin.webplugin
Silverlight.plugin
flashplayer.xpt
nsIQTScriptablePlugin.xpt
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jp.co.canon.CUPSCAPT.BG.plist
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com.apple.remotepairtool.plist
com.microsoft.office.licensing.helper.plist
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Flash Player.prefPane
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Ninas-MacBook-Pro:~ ninasingh$

Hi..
Try Resetting the System Management Controller (SMC)
As a rule it is not a good idea to run Terminal commands unless you have a better understanding of what the results should be.

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?
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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.
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The fan gets really loud sometimes

I just bought my Mac a couple weeks ago, not more than a month ago, and I haven't really downloaded a lot onto my computer. But sometimes the fan comes on really loudly, like it's having a hard time cooling the computer. Granted this happens usually when I'm on a site or using a program that is graphic intensive, but it only started doing this sometime this week. Could there be something wrong with the computer?

Your MacBook is behaving as it should. The fan will come on when the CPU is working overtime.
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I have a 2010 MacBook Pro and bought it in the summer of 2011. Last august the fan started making really loud noices. I have checked my CPU usage and Itunes was a laggy factor which was resolved when i shut itunes off. I am still wondering why my fan goes crazy. I have also reset the SMC.
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Run an Apple Hardware Test. Your MBP may have a bad sensor:
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Ciao.

It's fan sounds really loud...should i be worried?

so hot imac, that seems to be a common one.. but now it's fan sounds really loud...should i be worried? obviously it's cool the hot mac but it's very loud

kitty.treacy wrote:
so hot imac, that seems to be a common one.. but now it's fan sounds really loud...should i be worried? obviously it's cool the hot mac but it's very loud
I'm completely confused. The iMac is hot? It's cool? I don't think we know yet it's a G5.
Anyway, if it's an iMac G5, for the fans try an SMU reset.
http://support.apple.com/kb/ht1767
If it's not an iMac G5, Google "SMU Reset" for your model.

Really really loud macbook fan - with video example!

recently, my mac has been making a really loud noise, and it is obvious that it is the fan.
the video is here:
http://www.youtube.com/watch?v=sVIwrGe17x4
and a better example is here:
http://www.youtube.com/watch?v=UDjmYiUdybI
any ideas?
i've had a look inside my macbook, but there seems to be nothing inside the fan.

I feel your pain. Hardware problems are big headaches...and your fan's noise almost caused me one. I have to say though, that was an extremely funny video! It looked like the camera man was sniffing the computer like a curious dog. Also, what military training film was playing on the screen? Scary. Maybe it scared your fan, too.
Good luck with the 'puter.

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Recently when i was using my macbook pro, the fans seemed to go into overdrive and started making really loud noises, the noises sounded like it was rattling slightly. I didn't have any strenous programs running, just pages and google chrome, but the sound persisted until i put my computer to sleep, then it stopped. Right now it is queiter, but what should i do to avoid this in the future?

If your fans are going crazy when you aren't loading the system, then something is wrong. Try an SMC reset. And to make sure some background process hasn't gone wild, run Activity Monitor (from Applications > Utilitites) and select All Processes - anything suspiciious running over say 10%? (You can sort by CPU% by clicking on the column label.)

Fan really loud

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