Lion causes iMac fan noise during sleep mode

Ever since upgrading to Lion, my iMac's (early 2009 model) fan will randomly go into high speed mode (very loud) in the middle of the night when the iMac is in sleep mode. This seems to happen more often if I manually put the iMac into sleep rather than letting it automatically go into sleep mode as defined in the Energy Saver settings.
Anyone else experiencing this? I posted a feedback report (http://www.apple.com/feedback/macosx.html) so I hope Apple can fix this soon.
Eric

Hi Mendl,
Ok, what I discovered after running the AHT test, long version, was that the test doesn't see the actual failure I had in a new iMac. It turned out to be what I suspected all along, which was a defective temperature sensor, or more likely a factory assembly issue on that component.
They replaced my computer and now all is well.
Thanks, for reinforcing my suspicions!
Keep up the good work.
enumscrat

Similar Messages

IMac 2009 (21 inch) making hard drive noises during sleep mode - normal??

Hi there guys,
I have an iMac 21 inch (2009) , 3ghz C2D, 4GB Ram, 1TB hard drive (the hard drive was upgraded straight thru apple, when i bought it i paid extra for a 1tb hard drive, its not a DIY hard drive upgrade)
aniways, I recently noticed that during sleep mode, occasionally (not all the time) I can hear some faint clicking / hard drive noise, which is really weird because i put the imac in sleep mode and it really shouldnt be doing that no?
My 13 inch macbook pro 2010 never does this in sleep mode, its always dead silent
Im just wondering if this hard drive accessing / clicking noise during sleep mode is normal in imacs??

Im just wondering if this hard drive accessing / clicking noise during sleep mode is normal in imacs?
No it should not be doing anything but sleeping. The SMC controls sleep, try resetting it.
Reset the SMC
• Shut down the computer.
• Detach the computer's power cord.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Reattach the computers power cable.
• Turn on the computer.
Dah•veed

Imac shuts off during sleep mode

when in sleep mode my 2010 imac 21" shuts off after a couple of hours? It starts up fine but happens evertime its in sleep mode.

You may improve some of your power issues by resetting the SMC on your iMac by using the instructions found here: http://docs.info.apple.com/article.html?artnum=303446
The only other thing I can think of, outside hardware/power supply problems, is your power is getting cut off for a brief period. You can go to System Preferences > Energy Saver > Options > you can CHECK 'restart automatically after power failure' - if this is already selected, then I would think it maybe a hardware issue... let us know
Rick
iMac G5 iSight 20" - 30G iPOD in Slimming Black - Mac OS X (10.4.7) - HP Pav 15" WS and Toshiba Sat 17" WS LP's - Canon 20D & A620

Charging iPod nano on an Intel iMac during Sleep Mode by Firewire

Hi everybody,
I have a question concerning the iPod nano. I know that you can not sync the iPod by Firewire but you can charge it. I also know that charging the nano via USB during Sleep mode is NOT possible. However I had a 3G IPod (connected by Firewire) and it was possible to charge it when the Imac was in Sleep mode. And here comes my question:
There is a special cable for iPods, which has both Firewire AND USB. Is it possible to connect the IPod simultaneously by Firewire and USB to the Imac with the result, that the nano will charge during sleep mode (Firewire) AND is able the sync music (USB) ???
Thank you

Hi lora,
Don't do it! See this post:
Using the iPod Dock Connector to FireWire and USB 2.0 Cable
Which states this: "Important: Never connect both the FireWire and the USB 2.0 connector to your computer at the same time. Doing so can cause unexpected behavior."
Good luck,
maz

I have an iMac (Mid 2010) and am running 0sx 10.8.5 and the WiFi always loses connection during sleep mode. I have seen numerous different solutions none of which seem to work. Can anyone help?

I have an iMac (Mid 2010) and am running 0sx 10.8.5 and the WiFi always loses connection during sleep mode. I have seen numerous different solutions none of which seem to work. Can anyone help?

Test after taking each of the following steps that you haven't already tried. Back up all data before making any changes.
1. Make sure the network is on the preferred list by following these instructions. It's important to read the article carefully, as it's the starting point for any further efforts to solve the problem. If you skip any of the steps, the problem may not be solved. Make sure the box marked
          Remember networks this computer has joined
is checked.
2. Follow the instructions in this support article under the heading
          Symptom: After restarting or waking from sleep, my computer might not connect to the Internet
3. Reset the PRAM.
4. Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.
5. From the Location menu at the top of the Network preference pane, select Edit Locations. A sheet will drop down. Click the plus-sign button to create a new location. Give it any name you want. In the new location, set up the Wi-Fi service with the same settings you used before. Click Apply and test.
6. Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
7. Repair permissions on the startup volume.
8. Turn off Bluetooth and test.
9. Reset the System Management Controller.
10. This step shouldn't be necessary, but has been advised by Apple Support in some cases, apparently as a workaround for a bug. Open the Energy Saver pane in System Preferences. If applicable, click the padlock icon in the lower left corner to unlock the settings. Enter your administrator login password when prompted.
Select the Power Adapter tab and uncheck the boxes marked
          Wake for Wi-Fi network access
and
          Enable Power Nap...
if present. Then, if the computer is a MacBook, select the Battery tab and uncheck
          Enable Power Nap...
11. Reinstall OS X.

IMac Fan Noise - Not The Usual Problem

Hi,
I have seen plenty of discussions on iMac fan noise but mine is a little different. A week ago, a 'tink' noise (similar to tapping your fingernail on a glass) started coming from my mid 2011 iMac. At first, I thought it was the "click of death" for my hard drive, so I replaced it myself. This didn't fix the noise, so I ran an extended hardware test. This came back with a 4MEM error. I had some spare RAM, fitted it, ran the test again, no 4MEM error.
So, I booted the iMac again. 'Tink'... 'tink'. I finally located it to the bottom right of my iMac, where the optical drive fan is located. This fan has always rattled a little now and again but now it seems intent on driving me round the bend with its very own form of torture. At first, the 'tink' was now and again, but now it constant. 'tinktinktinktinktink'. Is there a way to stop the optical fan for now? I don't use the optical drive often anyway. Or would it just be a replacement fan?
Resetting SMC or PRAM does nothing.

This may be way off target, in which case ignore me. Do you have an app called Free Memory installed? There have been a few posts on here where it seems to cause repetitive odd noises to occur, particularly when running Mavericks?

Wifi gets disconnected when iMac is restored after sleep mode.

Everytime my imac is restored from sleep mode I have to reconfigure my wifi settings, starting to become a pain.

HACKINT0SH wrote:
It's a known issue, engineering is working on it.
Do you know this as fact? For engineering to be working on it, they would have to admit they had a problem.
In the meantime, I would simply disable sleep mode. It's not like an iMac really needs it.
Also questionable. I've seen the electrolytics on the logic board "pop their tops" on an iMac that had sleep mode disabled.

Does a mac perform self diagnostics during sleep mode?

does a mac perform self diagnostics during sleep mode? I was told it does about 10 years ago.

Russa wrote:
.. but it you leave it on at night, the OS will run the Unix CRON maintrenance routines.. during 3:15 and 5:30am (not in Sleep mode), the cron tasks will be run.
http://support.apple.com/kb/HT2319
Russa, from the KB article you linked notice that those maintenance scripts are no longer invoked by cron. They are invoked by launchd:
Additional Information
The tasks are scheduled for 03:15 to 05:30 in your computer's local time zone. This is described further in "Mac OS X: Unexplained Disk Activity Produced by 'find' Process." These tasks do not run if the computer is shut down or in sleep mode. If the tasks do not run, it is possible that certain log files (such as system.log) may become very large in Mac OS X v10.5 or earlier.
Therefore no user intervention is required, unless you are running Mac OS X "Leopard" or earlier.
It may seem overly pedantic to bring this up but this common misconception has a tendency to lead people into believing a Mac requires the user to perform maintenance over and beyond what OS X already accomplishes by default.
As others have written, a Mac takes care of its own housekeeping. It is best to simply let it work as designed.

Fans spin during sleep

Hello,
can anyone help? - im using the latest os and the latest firmware, but for some reason my fans spin during sleep - its been like it a while, but it never used to happen...
any clues as to how i can remedy this?
thanks for your time
Lee

Hi Lee Harding-
Reduce your setup to keyboard and mouse each plugged into their own USB port on the Mac, and video connected to the monitor. Remove all internal PCI cards (if any) and unplug everything, including hubs, from the Mac.
If this works, add things back one at a time until you find the culprit. If this configuration doesn't work we will dig deeper.
Luck-
-DP

Severe battery loss during sleep mode

I have a brand new MBAir and I'm trully intrigued about the loss of batery happening during sleep mode. I've fully charged it on Friday, and, since then it's been on sleep mode. Today, finally turnign it on this night to work a bit, I found it has only 73% of charge! What can be happening? IMPORTANT: My "power nap" mode is OFF since I've bought it and started using and noticing this down charge. Can anyone help me?

I've just solved it all when I noticed I kept plugged in my wireless mouse receptor. Just plug it out before leaving the MBA in sleep mode, and the problem was solved.

IMAC gets stuck in sleep mode

Hi all!
Could somebody please advice me what is going on with my iMAC Intel Core i3. I have just installed new update for 10.6.8. iMAC gets stuck after sleep mode. Power on/off is only the way to get him alive.
I tried to 'google' this issue. Non of topics I found helped ;(
Please!!

You can try some basic troubleshooting:
First restart in Safe Mode this will clear some caches.
If that doesn't help then use Disk Utility (Applications - Utilities - Disk Utility) to Repair Disk Permissions
If that doesn't help then download and install the 10.6.8 Update Combo. Of course make sure you have a good backup before installing the Update Combo!

Mbp pro retina 13" after installing mavericks keeps fans running in sleep mode.

Hi. my Mbp pro 13" retina keeps fans running in sleep mode, tried to reset smc but not helping. So maybe someone have some solutions?

Information.
Fans – Monitor Computer Temperature – iStat Pro (widget)
Fans – Operating Temperature

IMac 27 5k (late 2014) fan runs low speed nonstop during sleep mode

Hi,
New to the Mac community. Had the iMac 27 5K for about a month now. I've noticed the fan in the back of the monitor runs on low the entire time it's in Sleep Mode. I need to put my ear up to the vent to hear the fan running but can definitely feel air blowing out of it even after it's been sleeping for a few hours. It runs on low throughout the night. The fan stops completely only when it's shut down. Since this is my first iMac, not sure if this is normal or not? Can anyone confirm or have the same occurrence? Thanks for your input.

UPDATE:
For anyone with the same issue with this model of iMac; the fan running on low when it's in sleep mode is NOT NORMAL. I eventually brought the computer into an Apple store. They ran diagnostics and nothing. This model being so new has not had many logged issues in their database. They were going to reinstall the OS but after I reiterated that the fan runs all throughout the night while in sleep mode they decided to exchange it for another new computer. As an aside I noticed a large spike in my electricity bill in the month I've had the iMac hence noticing the fan ran all the time while in sleep mode. Otherwise, I wouldn't have look into it as an issue. I'm pleased to say that with the new computer, when I put it into sleep mode, the fan stops. Hope this helps others who run into this problem.

White 24" iMac lockup during sleep mode

I have recently been having problems with my iMac it won't wake from sleep and has to be unplugged and restarted or every time it goes to sleep it locks up. The light on the front is on but not flashing as it normally does during sleep. I run Onyx frequently and it does not seem to help for long(Maybe 2 days max) I am at the point where I am only using XP in Bootcamp because it seems to run much better than OS X.
Here are my specs:
24" iMac 250 GB internal drive, 500 GB firewire 800, 2 GB Ram.
USB devices: Wacom Intuos 3 tablet, logitech NuLOOQ, HP Deskjet 5940, VXI USB Translator(USB Audio device for speech recognition) Sentinel Safenet Dongle for Lightwave 3d.
Bluetooth devices:Mighty Mouse and Keyboard, Motorola HT820 headset for Telephony
I have disconnected everything I can and it still seems to lock up under OS X So it looks like I'm stuck with XP until I can resolve this. >:(....

First - you aren't disconnecting any device while your computer is asleep are you? This can cause your problem.
Assuming this isn't the cause, let's do an SMC reset. Shut down the computer. Unplug all cables from the computer, including the power cord and any display cables. Wait at least 15 seconds. Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer. Press the power button on the back to start up your computer. Does it now sleep and awake?
If not srojtas is right that one of your peripherals may be the culprit but rather than disconnecting one at a time I recommend that you disconnect everything but your ethernet cable (assuming you have one) and your USB mouse and keyboard. Create a new account and set the computer so that you have to choose which account to log into.
Restart and log in directly into the new account. If it sleeps and wakes up now you know that the issue is your account or one of your devices. One at a time, connect (and install support software for) a device. Does the computer wake and sleep? Move on to the next. You may find the culprit along the way. Removing it may or may not let the computer sleep depending on whether it is the device itself or the software.
BTW - the device at fault could be a USB or FireWire hub.

OSX Lion iMac fails to enter sleep mode.

Hello
My 2010 iMac fails to automatically enter sleep mode after upgrade to OSX Lion.
There is no problem using the keyboard shortcut or the sleep command in the menu.
However, it´s driving me crazy that it does do it by itself.
The energy saving options are set correct (enter sleep mode after 10 minutes).
I have tried to reset PRAM as well as SMC.
Internet sharing is turned off.
Any ideas......?

I have the same problem - late 2009 iMac, will not sleep after set period of inactivity. I have tried many things, including SMC and PRAM reset, 10.7.1 update, disabling Little Snitch, GlimmerBlocker, etc. etc., even removing Wacom tablet drivers and Flip4Mac, and disabling websharing (Apache), and switching internet sharing on and then off again. No difference. The only benefit is that I have learned I can sleep my Mac by pressing and holding the play button on the remote...
One thing I have noticed though is that I can hear disk activity when under 10.6 I would not expect it. Maybe something is accessing the disk and that is keeping my Mac from sleeping.

Lion causes iMac fan noise during sleep mode

Similar Messages

Maybe you are looking for