HT4543 just turned on my mac desktop and the fan is running on high   it is room temperature   what is going on?  thank you!

why is my iMac fan running & very loud?  just turned it on after being off for the weekend.  this has never happened?

Hi ..
Try an SMC reset as suggested here >  iMac: Fans run at full speed after computer turns on

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    timfrombrisbane and ScuseMe are right.
    Apple engineers say, that to reset SMC, you follow the procedure outlined in KBase Article HT1379.
    How much you've posted to the forums is irrelevant rkaufmann87. You're not one of the engineers who created the product.  The engineers who created the product, say to follow the steps outlined in that article HT1379.
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    People come in here, for computer science advice. I cited my source, for this scientific procedure. My source, is an article from the computer scientists who created the iMac product. I'm also an Apple certified repair technician - so I listen to what the Apple engineers say.
    Can you cite your *official* source for your incorrect procedure? Didn't think so.

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  • My mid-2012 MacBook Pro has the fan constantly running. As soon as I turn it on. My MBP won't even be hot and the fan is running. How can I fix this?

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    If you are still under warranty and/or have AppleCare, call them.  Let them deal w/it.
    OOW try the following:  http://support.apple.com/kb/HT1411 Apple Portables: Resetting the System Management Controller (SMC) 

  • I just had the seagate hard drive replaced and the fan is running loud

    I just had the seagate hard drive replaced and the fan is running loud

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    tthe battery need serviced but my computer runs slow and the fan is running non-stop. MacBook Pro 13" purchased around 2011.

    OK, you really need to dump that Windows attitude quickly, because what worked over there is completely useless here.  I never understood the "upgrade didn't work obviously, because this or that happened, so how do I downgrade."  I hang out around here, and I haven't seen many comments about fans running full blast after the updates. I did them, and nothing happened.
    First, you can't downgrade the firmware EFI update.  I think if you tried, it would brick your MBP.
    You could reinstall Lion if you wanted, but that's really a pain, and once again, one of those Windows things that people always do that wastes time.  A security update and Remote Desktop Client (which only runs if you start it up) would not effect your fan speed.
    Apple does have "restore points", but it's a real backup system that requires a backup drive.  It's called Time Machine and it's preinstalled on your Mac, easy to use, and allows you to go as far back in time on your Mac as the size of your backup drive will allow.
    Now, after all that, let's try to figure out what's going on with your fans.  First, did you do the EFI update correctly?  Meaning did you do it when the MBP was actually plugged into the wall?  What are you running?  Games?  Videos?  Something else?

  • I have a dual 1.8 ghz pwer pc g5 and sometimes i put it in sleep mode and come home on my lunch break and the fan is running at full speed and the computer has frozen up...what is going on here?

    and sometimes i put it in sleep mode and come home on my lunch break and the fan is running at full speed and the computer has frozen up...what is going on here? is it a virus or has my computer been hijacked? it cant be good for the computer...anyone ever had this problem..?

    Your problem has been reported many times, but causes are as varied as individuals.
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    Can I assume that you have used Disk Utility from your OS X install disc to repair the hard drive directory? The freezes and hard shutdowns require that the drive be repaired (not permissions) or soon the machine won't boot at all.
    If the root issue is software related, in Console (the application) under Logs, there should be loggings around the time of sleep and logs that tell you what process went wild and froze the machine.
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    http://support.apple.com/kb/ht1776
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  • Just turned my macbook air on and the screen is white except for what looks like a camera with a question mark flashing.  any ideas what to do?

    turned by macbook air on and the screen is white with a question mark flashing and nothing else on the screen. will not boot up.

    Click here and follow the instructions. If the computer was running Mac OS X 10.6.8 or earlier and you reach the third set of steps, insert a Mac OS X install disk or connect the computer's original thumbdrive.
    (124635)

  • Just updated to 10.7.2 and the fan on my 2011 mba wont stop running.

    I updated my 2011 Macbook Air to 10.7.2, and now the machine is really hot and the fan won't stop running. Any idea how I can make this stop?

    There is likely a program or process that is taking up most of the CPU.  If you open Activity Monitor and sort by the % CPU column that will tell you which process it is.  If its a program that don't need then you can simple quit it. If its something you don't recognize or something that you need to have running then report back and then the next course of action can be figured out.
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  • I'm wondering if anyone else has had problems with their imac fans being extremely loud when running at slow speeds?  When the computer heats up enough for the fans to run at higher speeds they quiet down. New HD fan was just installed.

    I have an imac that I've had for a couple years.  The fans have always been loud when running at the slower speeds.  When the computer heats up enough for the fans to run at a higher speed the fans quiet down.  I had installed SMC fan control after multiple attempts with Apple to get the fan issue resolved.  That seemed to keep the fans quiet enough.  I've never had a problem with overheating.  Recently the fans were becoming loud again even running at the slightly higher speeds so I took it to my local Apple store and they replaced the hard drive fan.  I got it back and it's now as loud or louder than ever!!  And, now SMC fan control won't "stick."  The fans will speed up, but then gradually go back to the lower "loud" levels.  I'm at a loss as to what to do next. 

    Thanks jared,
    I'm still dealing with this issue through Apple. Some time after I posted this, I contacted Apple again. They did start a case up for me, as I was experiencing the same behavior on two different machines, with two different versions of Windows.
    So far it remains unsolved. I've logged iClouds for Windows on my desktop, which is brand new, then logged for awhile after completely uninstalling Norton Security Suite, depending on the Microsoft security for some time, and finally logged after I uninstalled iCloud for Windows, restarted, installed a clean download, and connected using a completely different test account, which Apple set up for me. None of this made any difference. Looking at the logs, it seems every 10 minutes, iCloudServices.exe creates a new TCP connection to confirm I'm using less than 5GB on iCloud, (which I am by a good margin, using less than 2GB), it seems this connection is not closed, and when the next iteration rolls around 10 minutes later, a new TCP connection is created. I come very close to having 6 TCP connections created per hour, until I restart my computer. This works out to... 6 x 24 = 144/day.
    Perhaps the article you posted will shed some further light on this. I'm thinking seeing the state of the connection through netstats, at the least, could help.
    For the last week, I've been putting a hold on further logging, as Apple wants me to create a new user account on one of my computers, install iCloud for Windows there, and log it running in the other account. This however basically means I cannot use my computer for a fair number of hours, and I've been busy enough with work the past week that I haven't the time or energy to afford to set this up and run it. I've had need of my computers too much for the past week.

  • Macbook didn't fall asleep and the fan was running?

    I closed my macbook this afternoon and expected it to fall asleep like every other time, but after getting back this evening, I noticed the fan was running as if it was hot, it wasn't asleep, and I had to reboot using the power button in order to get back into Mac OSX. What is going on here? Does this happen on occasion? Or do I need to take it in and get it fixed? This is the first time it has happened and I've had it for about a month and a half. Thanks for your info.

    No. If something would have overheated, it would have shutdown completely, and the fan wouldn't have been running.
    When your OS stops communicating with the hardware, the fan kicks in to protect the computer from catastrophic damage. Same with iMacs, Power Macs, etc. By running, it actually protected the MacBook. You should be fine.
    -Bmer
    Mac Owners Support Group
    Join Us @ MacOSG.com
    ITMS: MacOSG Podcast
     An Apple User Group 

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