The fan on my iMac never shuts off?

The fan on my iMac never shuts off? Would someone be able to suggest what is the probable cause of this and what can I do about it?

Sometimes an SMC reset can help resolve this. If it fixes it but proves to be temporary a trip to the workshop may be needed:
http://support.apple.com/kb/ht3964

Similar Messages

  • Does anyone know why the fan on my imac wont turn off?

    does anyone know why the fan on my imac wont turn off?

    Peter.L.
    Try resetting the SMC, it may take 2-3 attempts. Please post back with the results. If you're not sure how please follow the instructions in Intel iMac SMC and PRAM resets

  • H330 Fan Never Shuts Off

    So as the title says the side fan and only fan in my H330 never shuts off so either I am running hot or the fan is malfuntioning. Around what temps should I be looking for in my bios to help diagnose the problem ? Any other idea or suggestions greatly appreciated. I still have a warranty so that is also an option for me FYI.

    hi grandprix60490,
    Welcome to the Lenovo Community.
    The fan usually spins at a high rate if the BIOS configuration is setup that way or if the thermal sensor is picking up high temperature reading. If you're concern about the heat, you can use CoreTemp to monitor the temperature (it also monitors the TJ Max of the CPU (this is around 95-100 degrees celsius for Intel chips). When a CPU core goes beyond the TJ Max, a CPU throttle, downclock, a BSOD, or a system shutdown will occur. You can get it here - http://www.alcpu.com/CoreTemp/
    If you're hearing any rattling / grinding noise that's comming out from the fan, you will need to send the unit in for service. Otherwise, if you're just running on medium load and the one of the CPU core reaches TJ max, the thermal paste (CPU cooling compound) needs to be re-applied.
    Hope this helps
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  • My iMac turns on the start up chime sounds, you see the apple icon on the screen and then it just shuts off.  Any ideas?

    My iMac turns on the start up chime sounds, you see the apple icon on the screen and then it just shuts off.  Any ideas?

    Do these two resets:
    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.
    The 5 second timing is important to a successful reset.
    PRAM RESET
    Zap the PRAM
    Shut down the computer.
    Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    Turn on the computer.
    Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
    Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    Release the keys.

  • Press B3 on a keyboard, and the tone never shuts off

    This is happening in the ES E synth, the ES M, the ES1, the ES2, and EXS24. And only in Logic, not in Reason or Live.
    I select one of these synths, and as soon as I press the B3 key on my MIDI controller keyboard, the key tone will never shut off. All other keys continue to work fine, but that B3 will never shut up again once it is pressed. This happens (currently) 100% of the time for me.
    Makes the software pretty useless..

    Hello korncompaq,
    Your computer will not boot.
    It sounds like you may have a problem with your board.
    I’d suggest take the computer somewhere local and have them check everything out.
    Let me know how everything goes.

  • The fan on my iMac runs on and off

    It has been a while now and i didn't really think much of it but the fan on my imac keeps running really loudly on and off. i don't really know much of the terms people were using while reading other discussions but i want this noise to stop!! please help me!

    When you close the applications does the fan slow after a few minutes or keep on sounding loud? If it quietens down then one of your aplications is is working hard and the fan is keeping things cool, if the noise does not stop then you could have a hardware fault.
    Try resetting the Pram and SMC, link is to the SMC reset and the page has information on a link to teh PRAM info.
    http://support.apple.com/kb/ht3964
    After that I think you will need some local advice, perhaps an Apple store.

  • My iMac never shuts down properly

    My iMac never shuts down properly, sometimes it says that i need to force quit my wireless internet but even when i do that it just has the white screen and I have to hold the power button down to turn it off properly, why is this and how can i stop it

    Hello,
    One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
    PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
    Reboot, test again.
    If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts (Users & Groups in later OSX versions)>Login Items window to see if it or something relevant is listed. Or an errant process eating up RAM.
    Check the System Preferences>Other Row, for 3rd party Pref Panes.
    Also look in these if they exist, some are invisible...
    /private/var/run/StartupItems
    /Library/StartupItems
    /System/Library/StartupItems
    /System/Library/LaunchDaemons
    /Library/LaunchDaemons

  • Hello i have a problem with my macbook pro become to slow to write any thing, to do any thing and the fan is always on never stop what can i do?

    hello i have a problem with my macbook pro become to slow to write any thing, to do any thing and the fan is always on never stop what can i do?
    i already reinstall the software many times and still the same i dont know what is happening is there is somebody who can help me please im will waiting

    There are any number of possibilies... you could have problems with runaway applications, causing your machine to overheat and setting the fans off, you could have bad fan sensors, etc.
    Open Activity Monitor (Applications>Utilities) and see if you have any apps that may be hogging the CPU. Call back.
    Clinton

  • IMac G5 shuts off by himself

    hello everybody,
    I have an iMAC G5 20' and I just update the system with Tiger X.4.7 a week ago and since then my iMac is shutting off abruptely by himself without any warnings. It happens two times last week and tonight it happens twice.
    The overall temperature of the Mac seems correct
    Anyone has any idea ? I already saw that some MAc Book users seems to have the same problem !
    Any comments ? Thanks for your help
    Jipes

    Hi, Jipes.
    Could be a power supply problem or an issue with mains power: assure the power cord is connected properly to the computer and mains power, and that the power cord is undamaged. Try a different power socket. If you use a UPS, be sure the battery is good.
    As far as general iMac G5 troubleshooting goes:
    1. See if your computer's serial number is in the range specified in the "iMac G5 Repair Extension Program for Video and Power Issues" document.
    2. Rule out potential hardware problems. Run the Apple Hardware Test that came with the computer. Instructions for doing so will be found in the hardcopy manual that accompanied your computer. For additional details, see my "Apple Hardware Test" FAQ.
    3. Check the diagnostic LEDs, a feature of your iMac G5. See "About the iMac G5 diagnostic LEDs."
    4. If your iMac G5 will not turn on, see "iMac G5: Troubleshooting when your computer won't turn on."
    5. See also the iMac Service & Support site.
    6. Check the iMac G5 Discussions for similar reports from other users.
    7. As a general check, run the procedure specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
    8. If the computer is either under warranty or covered by an AppleCare Protection Plan, don't hesitate to take advantage of your warranty and contact AppleCare.
    Good luck!
    Dr. Smoke
    Author: Troubleshooting Mac® OS X
    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
    I may receive some form of compensation, financial or otherwise, from my recommendation or link.

  • My 27inch iMac automatically shuts off

    My 27 inch iMac will shut off automatically after about 30 to 45 minutes - it will not turn on when using the on/off power button.  I have to unplug from the wall, hold down the on/off power button for 10 seconds, plug it back into the wall then usually, it will turn on.  I have tried using different wall outlets and not using a power strip but unless i follow the previous steps, it will not turn on. I ran an apple diagnostic test - it showed no issues with the hardware.  It was purchased from the apple refurbished store in April of 2013.  For hardware -processor 3.2 GHZ quad core intel core i5 - memory 8GB 1600MHz DDR3,  graphics - NVIDIA GeForce GTX 675MX  -software - OS X, iLife '11

    I think you should have received a 1 year warranty on this Mac, so I would take it in and have them fix it for free. If this is happening routinely at about the same time after boot up it sounds like an overheating issue, which is most likely hardware related.

  • The fan of my imac suddenly stays turning and very noisy!

    the fan of my imac sudddenly starts to turn, and very loudly. I can't stop it, unless I set off the Mac..What tot do?

    http://support.apple.com/kb/HT3964?viewlocale=en_US
    These instructions have recenty been modified. They used to read hold the power button in for five seconds after unplugging. I'd try it both ways.

  • The fan on my imac runs fast and doesn't stop.

    The fan on my imac runs fast and doesn't stop. I have to shut down the computer to get it to stop.
    Why is it doing that and how do i stop it?

    Reset the SMC using the directions below:
    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.
    PRAM RESET
    Shut down the computer.
    Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    Turn on the computer.
    Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
    Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    Release the keys.

  • What can I do to get my fan on my IMac to shut down?

    What can I do to get my fan on my IMac to shut down?  It is on high and is very loud.   Before this I didn't even know I had a fan.

    Try resetting the SMC
    Desktop Macs
    Shut down the computer.
    Unplug the computer's power cord.
    Wait fifteen seconds.
    Attach the computer's power cord.
    Wait five seconds, then press the power button to turn on the computer.

  • I have an MAC OSX 10.6.7 and when I turn it on the fan keeps running.  I shut down/turn on and it's the same.  Any suggestions?   Thanks.

    I have an MAC OSX 10.6.7 and when I turn it on the fan keeps running.  I shut down/turn on and it's the same.  Any suggestions?   Thanks.

    jean156,
    I am a little confused, you are posting in an iMac forum however your profile only indicates you have a MacPro. While I agree a SMC reset may help please carefully read the link The hatter provided because different Mac's have a different processes for resetting the SMC.
    In the mean time you may want to update your profile (Your Stuff in upper right and click Profile) and also please post in the correct forum to avoid confusion.

  • I was downloading the latest iTunes and my computer shut off in the middle and now my phone is displaying that it needs to connect to iTunes. iTunes says my phone needs to be restored before it will work with iTunes. HOw do i avoid restoring?

    I was downloading the latest iTunes and my computer shut off in the middle and now my phone is displaying that i need to connect to iTunes and iTunes is telling me that i need to restore my phone before it will work. I have pics that i have not uploaded yet, how do i get around this without restoring my phone? Thanks,

    I have the exact same issue. I havent found our what is causing it either. Multaple re-install attempts with no success. I have to use Windows Media Center to burn audio discs.  Any other advice?

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