External display on 2011 21" iMac won't sleep

I have a Samsung SyncMaster 213T attached to my iMac12,1 through a MiniDP->DVI Adapter attached to the Thunderbolt Port on the back of the mac. Now I have the problem that the display won't get to sleep together with the iMac's one.
This feature worked in the 2009 iMac with the same Adapter on the Mini DisplayPort port.
--Martin

So, I've turned off file sharing and the machine seems to be sleeping reliably. Next experiment is going to be to re-enable it but not actually access any of the files there. Goal being to see if simply having FS enabled is causing the sleeplessness, or if it's because it thinks files are actually being accessed. Incidentally, I found this old KB article about sleep not working while FS was enabled, but it's for 10.0 - 10.2. Anyone know if this is still applicable?
http://support.apple.com/kb/TA21023?viewlocale=en_US

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(Scenario in paragraph one, question in paragraph two)
I've got a problem trying to get data off an old iMac, and don't see an obvious solution... I have an old 2006 iMac that's been unused for years, and the display quit working about a year ago. I'm trying to just get the data off that computer, but my current 'main' computer's a MacBook Air that doesn't have an Ethernet port, so direct connection is out. I could try to move a couple hundred GB over wifi, but the wifi in the old iMac is an old wifi standard that takes forever, and tends to error out when transferring data over hours of time (I've tried).
Thus my question: The old iMac has a mini-DVI-out port, but the challenge is how to switch to an external display, when I don't have a display to navigate through settings? Is there a keyboard shortcut, or something? I've looked online, but can't find any solutions. I've got a mini-DVI-to-VGA cable, and a VGA-capable monitor, but when I plug the Mini-DVI into the iMac, to the VGA, nothing happens. I'm guessing I need to go to preferences, and select video-out? But that's impossible (as far as I've tried) with a display to navigate on the iMac.
Some miscellany: Someone suggested Command-F2 for something monitor-switching-related, but that did nothing. Someone at work thought that the signal from the DVI out might not work with the Gateway FPD1760 I'm trying to use as an external display...
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Late 2011 Macbook Pro won't sleep!

So I purchased a late 2011 macbook pro brand new from an apple store 3 weeks ago. Everything seemed well at first (except for a wake issue I had... odd)
Anyways... I started noticing that my notebook wasnt going to sleep, so I adjusted the power settings to sleep after 1 minute...
Sometimes the laptop will sleep after 20 minutes or more... sometimes it won't sleep at all (on all night!)
I'm wondering what the heck is going on? I tried re-installing Lion and using migration assistant to bring all my files back... no dice. same symptom.
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-I've tried SMC and PRAM resets
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-pmset -g log returns a few "slowresponses" but nothing too crazy (200ms)
-system log returns some odd "wake for GIGE (network)" responses while im trying to make it sleep.
-I deleted all printers /ques
The system WILL sleep if i manually click "sleep" or use the power button.
The system WILL sleep if i unplug the power cable and close the lid.
I have a 2nd display using a thunderbolt to DVI adapter... but unplugging this seems to have no effect.
What am I missing? could this be a logic board issue on a brand new mac? I'm lost! any suggestsion would help!

I may have solved this -- maybe -- by reinstalling Mavericks. Two days after the re-install (which was easy), the sleep function seems to be working properly.

External hard drives ejecting after iMac wakes from sleep.

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External Display will not turn back on after sleep

Just bought a new MBP last week and gave my wife the MB. I typically attach to an external 24" display and run in closed clamshell mode. I have been doing it for quite some time with no issues. Now with the new MBP if the energy saver kicks in and turns off the display, and/or the energy saver puts the computer to sleep when I attempt to wake it up the display flashes then goes blank. There is no way to turn it back on. When I open the clamshell the internal display will only show some random pixels and a white line at the top of the screen. There is no way to correct it unless I shut down the machine.
I am running with the Nvidia card, not the internal Nvidia. If I manually put the computer to sleep it will wake normally with no screen issues. It will also not act up if the external display is not connected.
Any help or suggestions of a setting I might have wrong that would cause this?

It is a Gateway FHD2400. Connected from mini display to HDMI. My previous MB was connected to the same monitor for the last year with 0 issues. It was connected mini dvi to VGA.
The issue is strange because it only happens when the computer turns off the screen or sleep. When I put it in sleep it doesn't happen.

24" iMac won't sleep!

Just wondering whether anyone else has encountered the same problem: my 24" Intel iMac won't go to sleep! Every single method of putting the machine to sleep does not work:
CMD-OPT-EJECT;
(ii) Apple menu - SLEEP;
(iii) setting the Power button to put the machine to sleep;
(iv) even just letting the machine go idle (after setting appropriate sleep options in System Preference).
What happens each time is the machine TRIES to go to sleep (the screen goes dark for a second), you hear a soft click coming from within the machine, and then the screen comes back on again. Any assistance/suggestions/fix would be greatly appreciated. THANKS!

Hi
If you have Disk Warrior, then use it to check the state of the HD directory. Directory errors can trigger oddities in the system. If you don't have it, open Disk Utility in your Utilities folder and "verify disk", seeing if any errors appear. DU is nowhere as advanced as DW; hence, errors may be present beyond the capacity of DU to detect or repair them.
If errors do appear via DU, start-up your computer from your Installer DVD. When fully booted, go to the Utilities menu, select Disk Utility and "repair disk". Rerun until you get a clean pass. Then restart the computer and try the sleep mode again.
Genius Bar visit either will lead to an Archive and Install of the OS, or perhaps a hardware repair (I think A & I).
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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

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(command F2 doesn't work).

Hi, does it have a Mini Display Port?, then you might need one of these...
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this problem seemed to magically fix itself after about half a week.... I'm not sure what was going on.

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Hi!
I figured out what the issue was, finally. After playing around, I noticed that my InDesign Fonts folder, had "alias" links to some fonts that resided on that shared drive. As soon as I deleted all the ones that where aliases, the error went away. Hopefully this helps someone in the future.
Rafa.

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Sleep was working fine when I first got the new machine; it seems to have stopped shortly after I upgraded to Lion. (I think it may have been working for a few days after installing Lion, but I'm not positive...I'm thinking now I just thought it was asleep because the display would turn off.)
I've looked at all the related sleep posts I could find but nothing seems to address this particular issue. I know I could just turn off sharing whenver I want it to sleep, but tha't's like having to disconnect my car battery when I want to shut the car off.
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Well, I'm certainly no expert at this and I'd never enable internet sharing (being too concerned about the health of my Mac and/or not knowing what untoward sites/networks/people may be seeking access), but it seems to me that having it turned on means that your computer is sharing a connection, so anytime anyone on the network seeks access, it will either wake up the Mac or cause it to stay awake. Here is an excerpt from the Help Menu (in Finder) (which has nothing to do with your question, but I found it interesting nonetheless):
If your Internet connection and your local network use the same port (Ethernet, for example), investigate possible side effects before you turn on Internet sharing. In some cases (if you use a cable modem, for example) you might unintentionally affect the network settings of other ISP customers, and your ISP might terminate your service to prevent you from disrupting its network.

2011 MacBook Pro won't sleep

I've got a late 2011 MacBook Pro 2.2 GHz Intel Core i7, 8GB 1333 Mhz DDR3. Pretty much fresh out of the box. It's running the latest version of Lion. In the last few days it won't go to sleep (for at least 5 minutes) when I close the lid. I've had to shut down 3 times to move the computer. What's up??

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Spoke too soon...
After following the method outlined a couple of posts above - (move the energysaver.prefpane out of it's folder (Macintosh HD > System > Library > PreferencePanes) and onto the desktop, restart, then double-click the EnergySaver.prefpane on the desktop and install for all users (installs it in Macintosh HD > Library > PreferencePanes)) - mine seems to be working again.
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Jo
Message was edited by: Josephiah
Looking at the original post again and comparing to my mac, it seems like it's a problem introduced in the latest versions of 10.5 and 10.6.

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Cesar, from Argentina, Buenos Aires
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*Thank you all!*
Sincerely, Cesar
Gracias a todos por las respuestas! Ya pude solucionar mi problema. Después de mirar varios problemas de otros usuarios se me ocurrió mirar la consola del sistema, y ahí estaba el secreto! Descubrí que había unos programas de terceros que ya no estaban instalados y daban error leyendo el disco cada segundo...
Muchas gracias a todos!
Saludos, Cesar

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As the title says.....
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External display on 2011 21" iMac won't sleep

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