IMac doesn't sleep

My iMac will not go into sleep mode. Regardless wether I select the Apple-Menu "sleep" item or push the on/off button at the rear or waiting for timeout: Always the effect is a "partial" sleep only, that means a dark display, but still a running disk.
I figured out so far, that if I disable WiFi the sleep mode works as expected.
Any suggestions?

Finally I found a solution!
It was clear that the problem was caused by some network stuff. While reading System Configuration Programming Guidelines I got the idea to play with network locations. I created a new clean network location and activated it and ... boom! That was the solution! Now sleep mode works as expected.

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My 2011 iMac doesn't work with display sleep anymore after installing a clean copy of OSX 10.8 Mountain Lion

My 2011 iMac doesn't work with display sleep anymore after installing a clean copy of OSX 10.8 Mountain Lion.
I have it on upper left corner but it take the whole computer to sleep, no way to turn just the display.

Hi, thaks for response, meant to post as a discussion (not question), wanted to save others time if they get the same problem

External hard drive won't power back up when iMac wakes from sleep

I have the external hard drive connected via USB. I always put my iMac to sleep before going to bed and I wake it up when I come home from work. Except that when I do, the external hard drive doesn't power up. It still shows in Finder, but clicking on it's folders just opens them up as if they were empty. There's no access noise and the drive can't be ejected.I have to switch it's power off and turn it back on for it to spin back up.
At first I thought it was because I had Energy Saver set to power down the drives whenever possible, which works just fine when it's on, the drive powers on and off as needed just as long as the iMac doesn't go to sleep. I turned it off just to make sure and it made no difference. As soon as the iMac goes to sleep and the drives powers down, it will not come back on without a power cycle once the iMac wakes.
I've used this drive in an old Macbook for years without having this problem. The only difference is that the Macbook was on 10.6.8. I was thinking about buying a 4 bay USB enclosure and filling it up with hard drives, but I'm not about to do that if every time I put the iMac to sleep, the whole thing will not power back on without a power cycle.
Any help would be much appreciated.

Not sure if you managed to get this issue resolved yet Marcus, but I too have a similar problem:
Currently I'm upgrading from Leopard to Lion (via Snow Leopard) on both an iMac and MacBook Pro (both Intel), but before I proceed with the OSX upgrade I wanted to back everything up. Thus far I have partitioned an external firewire drive (G Drive - one that is bootable), and cloned each machine using Carbon Copy Cloner to it's own partition (both GUID). There is plenty of space left over on each partition.
The issue - I can boot the OS X from the external drive on the MacBook Pro but not on the iMac.
When I restart and hold down Option on the iMac the only drive that appears is the HDD, not the other two selectable drives that are visible if I boot up on the MacBook Pro. On the iMac in System Prefs > Startup Disc I can see all 3 drives but when I select it and restart, the machine freezes on the grey loading screen and goes no further.
Not that it should make a difference, but there is a 3rd partition on the external drive that is currently empty (for extra storage).
Any help is greatly appreciated - I can't find any relevant answers elsewhere. Thanks,
Dan

IMac doesn't recognize input devices after going to asleep, must reboot

Quite often, my iMac doesn't respond when I attempt to "wake" it using keyboard or mouse. The only way to wake the iMac is to tap the power button. However, when it wakes the mouse cursor is a spinning color wheel and the system does not recognize any input from the keyboard or mouse. I can leave it sitting for quite some time and it still will not recognize my input devices. When this happens I must hold the power button to reboot.
This has been happening for a quite a while now, and it is highly annoying. I can't remember if this was happening before my screen was replaced by Apple a few months ago. It definitely did not happen before upgrading to Lion.
I am hoping you guys can help, otherwise I suppose I will be calling Apple and see if they can figure it out. I am tired of this!
Thanks,
Robyn

I'm having a similar issue. I put my screen to sleep before I go to bed, next day, the computer is frozen, but still on since I can detect heat from the top vent.
I've checked memory for any errors (5 hours of testing) and removed any system extensions. Still gets frozen.
I did attach an old USB mouse just to wake it up when it loses connection to the wirless bluetooth devices. I've been able to wake it up from this condition a few times.
I will keep investigating. My iMac is 1 month old, 27" i5 quad core.

IMac won't sleep and freezes on shutdown

My iMac has developed an annoying problem. Most nights, when I try to put the computer to sleep, it goes to sleep and the immediately wakes back up. I exit all programs running in the dock and try to sleep it again, but the same thing happens. I will then try to shut it down, but it freezes on the screen that shows the wheel with the lines (sorry for the bad description there). Any ideas?

Here's more on sleep;
This is for a Mac that won't sleep.
Here is KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.
If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB card.
Also, here is Apple KB article TA2469 about PCI cards and sleep.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
Tristan Currier noticed this; "I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
Good Luck!  DALE

Networking issues following upgrade to 10.5.8 when iMac wakes from sleep

Hello,
I recently upgraded to 10.5.8 and I'm now experiencing issues with network connectivity following the iMac waking from sleep. I have to stop Airport and then start it again to resolve the issue.
Can you provide any resolutions to this or advice?
Many Thanks,
Sam

Reinstall the Mac OS X 10.5.8 Combo Update because the Combo seems to help a lot of people when a Delta upgrade doesn't take right.

If I set my iMac not to sleep, but set hard drives to sleep when possible will they sleep?

If I set my iMac to never sleep, but my Hard Drives to sleep when possible why don't they sleep?

They don't sleep because your Mac is using them (as your Mac is turned on). If they go to sleep, you may damage the external drives because your Mac doesn't unmount the drives first

IMac doesn't automatically reconnect to wireless

Hello
i have an iMac middle 2007 with the latest Lion upgrade (10.7.4 11E53).
I use a Wireless connection, and I noticed that when my router restart my iMac doesn't connect automatically to its WLAN.
So, basically:
1. my iMac is connected to Wireless and Internet
2. the modem/router turns off
3. the modem/router turns on
4. iMac doesn't connect automatically (waves on wi-fi icon are grey)
I tried with resetting PRAM, deleting the entry of wireless on Key-Ring and re-saving it, read a lot of forums but i haven't found a solution.
It is an huge problem to me, i haven't that problem with my iPhone 4 and the modem/router is working correctly with others computers at home, so it's not a signal problem.
I can't explain why but my router sometimes is restarted at night, while i'm sleeping and my iMac should download gigabites of Legal stuff.
I just want that my iMac it works like my phone and any other pc
Thanks for any suggest and - PLEASE - avoid pointless comments like "don't restart your router"

SRS,
I have done the following to eliminate my iMac's desire to hook-up to whatever wireless system it wants: on the Network panel of System Preferences, with "Location: Automatic" go to "Show: AirPort" and the "AirPort" pane where I add my wireless network's name and security method (also delete all other networks listed), then above that change to the "By default, join: Preferred networks" and click the "Apply Now" button. Then click the "Options..." button and setup as: "If no preferred networks are found: Ask before joining an open network"
Then check the next two boxes for "Require administrator password to:
Change wireless networks
Create Computer-to-Computer networks
and uncheck the last three boxes. (unless interference robustness is needed due to signal interference from nearby systems or other sources)
Then click the "OK" button on that pane, and again click the "Apply Now" button.
I figure this solves most every issue that could come up for me. Hope it helps you.

Putting iMac display to sleep, when using TV as a screen.

I have just connected my iMac to my 42" Panasonic 1080p TV, the connection was easy and is working fine. My questions relates to putting the iMac display to sleep when using the TV as a monitor, if I am watching You Tube, Sky Player or a DVD, I intend to use my TV as the monitor. Is it possible for the iMac to puts its display to sleep, whilst leaving the TV on. I played around with this today, however was unable to manage this.
Regards Craig

Hi Craig
There is no way to independently sleep either the iMac's Display or an attached Display/TV. However if in the Display Arrangement Preferences you set the attached Display or TV to be the Main Display and turn Mirroring Off, then FrontRow and the Full Screen Mode app's like, DVD player, QuickTimePlayer, etc. will black out the unused iMac display.
Dennis

HT3382 I have a Samsung VGA Monitor connected to my MacBook Pro using the Mini Display Port to VGA Adapter. How do I configure the computer so that it doesn't sleep when I close the lid of the computer.

I have a Samsung VGA Monitor connected to my MacBook Pro using the Mini Display Port to VGA Adapter. How do I configure the computer so that it doesn't sleep when I close the lid of the computer.

Hi alangium,
Welcome to the Support Communities!
Resetting your computer's PRAM should restore your Macbook Pro's screen appearance.
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/ph14222
This article may provide some information about your Mini DisplayPort to AVI adapter. Have you tried to connect a different VGA monitor to your Macbook to see if you get the same results?
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
http://support.apple.com/kb/HT3382
18. What is the maximum resolution available for use with the Apple Mini DisplayPort to VGA adapter?
The resolution available with the Apple Mini DisplayPort to VGA Adapter is 1920 x 1200. VGA displays that use higher refresh rates (such as 85 Hz) at resolutions of 1600 x 1200 or greater may not generate video properly until you lower the refresh rate.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573#5
How can I detect displays?
If the detect displays option is not available, hold down the Option key while you are in the Display pane.
How do I select additional resolutions on my display?
You can use the Display pane of System Preferences to specify how your display works. Not all options appear for all display models. By default the best resolution for your display will already be selected in System Preferences.
To select a different resolution, use the Scaled option. Some additional resolutions may be available when you hold the Option button.
I hope this information helps ....
- Judy

My apple tv is registering on my tv - i can see it on my system info screen but the apple tv doesn't show up, as well my imac doesn't seem to let me share - so i don't know whats wrong, why my apple tv isn't working

anybody able to help me with my setup for apple tv. i've followed the directions in the guide and my tv doesn't seem to register in part. it's weird because my tv system info identifies the apple tv but the screen never went black and it doesn't show anything, too, my imac doesn't seem to register the apple tv unit either

I would try connecting it to another tv to see if it works there if it does
then likely your tv can't handle the default resolution and you should lower it on the other tv
if not then you should connect it by usb to the computer and use itunes to restore it's firmware

I tried to launch iCloud on iMac. I Changed my e-mail address recently, and iMac doesn't seem to know it. Even worse, it doesn't know any password I've used with Apple ID. Can anyone help me?

I tried to launch iCloud on iMac. I Changed my e-mail address recently, and iMac doesn't seem to know it. Even worse, it doesn't know any password I've used with Apple ID. Can anyone help me?

No, i don't. if i did i would have tried it. do you have to sign up an appled ID for iCloud? If the answer is yes then they should mention that in the set-up instructions.

My iMac doesn't recognise some photos on my Kingston camera card won't download on to my iMac

My iMac doesn't recognise some photos on my Kingston camera card but recigognises others. How can I get it to download the rest of my photos?

I'm using iPhoto. I have downloaded some off the same card but every now and then it refuses to recognise all of them. Can't figure out why as I perform the same action each time.

IMac doesn't detect the base station correctly (with new base station)

I have a brand new Airport Express. I'm trying to connect to my iMac G5. Everything works fine in the start up with getting the green light on the Express base station. But, my iMac doesn't "connect" with the base station.
I try the "Airport Setup Assistant" and get a window that says "No new Airport networks were found."
I look at the "pie" at the top of the iMac screen. It has the white and black stripes on it. I click it and find "Apple Network e3fec9" and select it. The signal level shown has all blue buttons. That window also reports "Status: Connected to 'Apple Network e3fec9'" and "Base Station ID:00:19:E3:E3:FE:C9". That's what makes me think that my problem must be in the iMac and not the base station.
I had also tried my Dell laptop (from work) and found that it found the internet network. It detected the "local host" and "Apple Network" and the signal strength was very good (~90% or so). The only problem was that the laptop thought it needed to recreate an IP address before it could connect to the internet. I didn't do that, since I saw it was detecting the network.
Please help. Why should this be so hard?
iMac Mac OS X (10.4.9) none

I'm confused. You say you're connected to "Apple Network e3fec9", and you're having trouble connecting your iMac? It sounds like you've managed to connect to your Airport Base Station.
Have you configured the Internet settings for the base station? Try this:
1. Launch Airport Admin Utility (in /Applications/Utilities/) select "Apple Network e3fec9" and click Configure.
2. Under the Airport tab, give the base station a name, click the Base Station Options… button, and make sure Enable Ethernet Port is checked.
3. Select Create a Wireless Network (Home Router) if it isn't already selected, give your network a name, and check Create a closed network
4.Click the Wireless Security button and set it to WPA Personal, and enter a password.
5. Under the Internet tab, set Connect Using: to Ethernet, and in the Configure dropdown, select Using DHCP
6. Click the Access Control tab and click the plus button on the right side of the window. In the panel that pops up, click the This Computer button.
7. Click Update
I'm hoping it's something simple, like Enable Ethernet Port wasn't checked or something, and not something more serious.
Hope it helps.
Rob
17 iMac G5 Mac OS X (10.4.2)
17 iMac G5 Mac OS X (10.4.2)
17 iMac G5 Mac OS X (10.4.2)
17 iMac G5 Mac OS X (10.4.2)

The iMac doesn't recognize my external hard disk

My iMac doesn't recognize my external hard disk. The iMac also keeps a DVD inside. It doen't throw it out despite "eject".

Sounds like you might need to make that call. In the meantime here are a few of things you could try that may help:
To eject the disk try a restart holding down the mouse button - hopefully it'll eject.
If you are running either Mountain Lion (10.8) or Lion (10.7) try booting into the Recovery HD:
Restart holding down Command+r. At the screen with 4 choices choose Disk Utility and then select Macintosh HD and click on repair disk. If it fixes anything click on repair disk again until you get a clean pass. Restart as normal from the Apple menu.
If you are running an earlier OS you would normally carry out this process by putting the grey restore disk that came with your Mac in the Disk drive and restarting holding down the C key. Choose your language and at the next screen from the menu bar select Utilities>Disk Utility and then follow the above instructions (I realise you won't be able to do this if you have a disk stuck in the optical disk drive).
Try an SMC and PRAM reset: https://discussions.apple.com/docs/DOC-3603
Try a Safe Boot: Restart holding down the shift key until you see a grey progress bar. Once it's booted restart as normal from the Apple menu.
If none of this helps, I guess you need to make that call. Good luck.

IMac doesn't sleep

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