Aluminium iMac won't sleep automatically!!

Let's see if someone can help me: I have an iMac 24 "aluminium, with 2.4 Mhz Intel processor, 3GB Ram. The problem: I have is that the iMac does not automatically enters into sleep mode, if I go to the apple menu and choose the sleep works OK, but if I hope to be performed automatically does not work. I see multiple users the same thing happens to them, and there is no way to solve it. Because I tried all ways and there is no case. What more sad is that I installed Windows Vista and XP and works perfectly through Bootcamp income resting my automatic MAC! Please if anyone can help me ...
Cesar, from Argentina, Buenos Aires
Veamos si alguien puede ayudarme: Tengo una iMac de 24" aluminio, con procesador intel de 2,4 Mhz, 3GB de Ram. El problema que tengo es que la iMac no ingresa en forma automática en modo de reposo, si me dirijo por el menú de la manzanita y elijo reposo funciona OK, pero si espero a que se realice en forma automática no funciona. He visto que hay varios usuarios que les pasa lo mismo, y NO HAY forma de solucionarlo. Ya probé todas las formas y no hay caso. Lo mas triste es que instalé Windows Vista y XP mediante Bootcamp y funciona perfectamente el ingreso en reposo automático de mi MAC Por favor si alguien puede ayudarme...
César, desde Argentina, Buenos Aires

Thank you all for the answers! Already I could solve my problem. After watching several issues from other users', occurred to me watching the system console, and there was the secret! I discovered that there were some third-party programs that were no longer installed and gave error reading the disk every second ...
*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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IMac (late 2009) won't sleep automatically

Hi everyone,
I hope anyone can help me out with this:
My iMac doesn't go to sleep automatically after the time I set in the preferences menu. The only thing that happens is that the display switches off.
I already tried several things:
deleted the file com.apple.PowerManagement.plist (Macintosh HD/Library/Preferences/SystemConfiguration)
detached all external devices
SMC reset.
turned off all running applications
None of these solutions worked for me.
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Hey Mad-Hias, greetings from the US. I use dyndns.com, you can get a free dynamic ip there as well as a Mac client. Many routers have a built in Dynamic DNS service but my Apple Extreme doesn't so I ended up using dyndns...
As for the sleep issue and my take on PleaseSleep. I think that the computer should work, period. If there is something going on that is preventing it from going to sleep when it is idle, I want to know about it in a log file or something, I want the system to do a better job logging this than it is currently doing in the console so that I can troubleshoot and fix and not have to resort to third party software. In OSX, if it is possible to have a process prevent sleep, then there should be a log file to show which processes are preventing sleep...
My latest bought with this lasted 5 months with my 2010 iMac before I decided to fix it:
My findings:
1. Computer will not sleep automatically.
2. What I tried:
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After doing all of this, I discovered that I had installed the dns update app which talks to the update service over the internet every two minutes, breaking sleep...
For the sake of putting a nail on this coffin and putting this issue to "sleep", at least for me, I will do a complete re-install this weekend with a full Time Machine restore using Migration Assistant of all apps + data of my working system and test again. This will give me confidence of using the Migration Assistant in the future.
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24" iMac won't sleep!

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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.
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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.
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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

Won't Sleep Automatically

Strange happening: I can manually put the computer to sleep, and when I close the lid it goes to sleep. However... it will not go to sleep at the time set in the Energy Saver Preference Panel. Thoughts?
PB G4 Ti 867 Mac OS X (10.4.6)

This is for a Mac that won't sleep.
First, read things in Apple doc.#25801 on sleep settings.
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 recieve 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 Recieve Faxes On This Computer box.
If that does'nt 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 cards.
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.
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DALE

Aluminium iMac won't power up after shutdown

Hello All,
I have bought a 20" aluminium iMac for my parents a couple of weeks ago. It went extremely well in the first few days, but I got the complaint from my parents that it cannot power up after the proper shutdown.
It is very strange that it won't power up after it has been shutdown for a couple of hours, unless I unplug the power cord and plug it back in after a minute or so (reset the SMC)
Oppositely, I can power it up normally right after it has been shut down for a few minutes. But never overnight.
I have tried everything I know about like reset SMC and PRAM, as well as running apple diagnostic. Symptom still persist (though the diagnostic says nothing wrong with my hardware)
Is there anyone facing the same problem as me ?
Thanks
Jimmy

Thanks Guys.
I haven't called Applecare yet. However, I have reinstall the system and done a software update EXCEPT the latest imac software update v1.1 released recently.
See if anything good happen tomorrow and will let you guys know
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Jimmy

MBP won't sleep automatically.

My Macbook Pro won't go to sleep and it's driving me crazy.
I have been watching my processes closely and haven't seen anything that would keep it awake. The screen goes off like usual but it won't actually go to sleep on its own.
I can make it sleep by closing the lid or pressing sleep under the apple logo.
I deleted com.bjango.istatlocal in my Library> launchagents folder
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9/22/09 4:56:09 PM com.apple.launchd.peruser.501[80] (com.bjango.istatlocal) Throttling respawn: Will start in 10 seconds
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9/22/09 4:56:19 PM com.apple.launchd.peruser.501[80] (com.bjango.istatlocal) Throttling respawn: Will start in 10 seconds
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9/22/09 5:08:31 PM iChatAgent[160] [Warning] AIMBuddyList::OnDownloadError: user=m3alpine97, error=(code=3, subcode=0, category=7, url="", message="")
9/22/09 5:08:31 PM iChatAgent[160] [Warning] AIMBuddyList::OnDownloadError: user=shahab323is, error=(code=3, subcode=0, category=7, url="", message="")
9/22/09 5:08:31 PM iChatAgent[160] [Warning] AIMBuddyList::OnDownloadError: user=myiprelay, error=(code=3, subcode=0, category=7, url="", message="")
9/22/09 5:08:31 PM iChatAgent[160] [Warning] AIMBuddyList::OnDownloadError: user=santaclaus, error=(code=3, subcode=0, category=7, url="", message="")
9/22/09 5:08:31 PM iChatAgent[160] [Warning] AIMBuddyList::OnDownloadError: user=santaclaus, error=(code=3, subcode=0, category=7, url="", message="")
9/22/09 5:08:31 PM iChatAgent[160] [Warning] AIMBuddyList::OnDownloadError: user=woobiee101, error=(code=3, subcode=0, category=7, url="", message="")
9/22/09 5:18:18 PM [0x0-0x1a01a].org.mozilla.firefox[165] Debugger() was called!
9/22/09 5:20:49 PM com.apple.launchd[1] * launchd[1] has started up. *
9/22/09 5:21:18 PM com.wacom.wacomtablet[69] TabletDriver[69]: Env RUNWITHLAUNCHD is set to 1
9/22/09 5:21:18 PM com.apple.WindowServer[50] Tue Sep 22 17:21:18 chad-muellers-macbook-pro.local WindowServer[50] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
9/22/09 5:23:52 PM com.wacom.wacomtablet[93] TabletDriver[93]: Env RUNWITHLAUNCHD is set to 1
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9/22/09 5:23:52 PM com.wacom.wacomtablet[93] TabletDriver[93]: #### GetFrontProcess failed to get front process (-600)
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9/22/09 5:23:52 PM com.apple.launchd[1] (com.wacom.wacomtablet[93]) Exited with exit code: 255
9/22/09 5:23:58 PM com.wacom.wacomtablet[117] TabletDriver[117]: Env RUNWITHLAUNCHD is set to 1
9/22/09 5:23:59 PM com.apple.launchd.peruser.501[95] (com.apple.Kerberos.renew.plist[114]) Exited with exit code: 1
9/22/09 5:24:00 PM com.apple.launchd.peruser.501[95] ([email protected][119]) Exited with exit code: 1
9/22/09 5:26:59 PM [0x0-0x17017].backupd-helper[162] Not starting Time Machine backup after wake - failed to resolve alias to backup volume
PLEASE HELPP!!!!!
Message was edited by: Slvre39

This is for a Mac that won't sleep.
Here is Apple's 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!"
Allan Jones says "sometimes there is Network activity: launch System Preferences > Energy Saver > "Options" tab and uncheck "Wake for Ethernet network administrator access."
Good Luck!  DALE

G5 won't sleep automatically

In an effort to save electricity and $$, I put my G5 on a sleep timer (10 minutes).
But it does not go to sleep by itself. Using the Sleep menu command works.
Any settings I might be missing that could be interfering with self-sleep?

just want to add my 2 cents - I've had this problem forever (it seems).
Standard PowerMac G5, aluminum 20" cinema display, firewire sight, white keyboard and mighty mouse.
Mac will NOT sleep automatically under any circumstances.
Mac will sleep when power button on tower or side of screen is pressed.
Mac will sleep, restart and power down when selected from the apple menu.
I've tried removing ram, pressing the SMU button, deleting Prefs, creating/deleting users.
Basically everything except installing clean from the Leopard DVD.
I've just learned to live with the 'fault' and choosing sleep manually.
If anyone can come up with a solution though, I will be forever in their debt....
cheers

PowerMac won't sleep automatically unless a DVD is inserted

I have a rather strange issue with my G5 - even though I have selected "Put the computer to sleep when it is inactive for 5 minutes" in System Preferences/Energy Saver, my computer never sleeps. However, when I have a DVD in the tray, the computer sleeps automatically every time. Any idea why a DVD in the tray makes a difference? And how can I have the computer sleep automatically when a DVD is not inserted? Thanks!

You say a DVD installed. Does it do the same with a CD installed?
Strange indeed. Look at this link.
Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/HT1776
Install this free utility & see if it will sleep properly.
PleaseSleep
http://www.dragonone.com/products/macosx/pleasesleep/
 Cheers, Tom

MacBook Pro won't sleep automatically - no process preventing sleep according to pmset. What's going on?

i noticed the following problem with my MBP 8,1 running 10.7.2 — automatic sleep just doesn’t happen. Since I usually put my Macbook to sleep manually before leaving the desk etc. I just noticed this issue and can’t really pinpoint it to specific updates.
Closing the lid works, selecting “sleep” from the Apple menu works. The only way to put my MBP to sleep automatically is currently PleaseSleep, which works fine.
Here’s pmset -g:
pmset -g
Active Profiles:
Battery Power       1
AC Power        -1*
Currently in use:
standbydelay   4200
standby    0
womp       1
halfdim    1
panicrestart   157680000
hibernatefile /var/vm/sleepimage
sms        1
networkoversleep   0
disksleep 10
sleep      10
hibernatemode 3
ttyskeepawake 1
displaysleep   3
acwake     0
lidwake    1
As you can see, no process is preventing sleep.
Here’s pmset -g assertions:
pmset -g assertions
25.12.11 03:05:34 MEZ
Assertion status system-wide:
   ChargeInhibit                           0
   PreventUserIdleDisplaySleep             0
   PreventUserIdleSystemSleep              0
   NoRealPowerSources_debug                0
   CPUBoundAssertion                       0
   EnableIdleSleep                         1
   PreventSystemSleep                      0
   DisableInflow                           0
   DisableLowPowerBatteryWarnings          0
   ExternalMedia                           0
Kernel Assertions: 0x0004
* Kernel Assertion ID = 500
   Created At = 01.01.70 01:03:17 MEZ
   Modified At = 25.12.11 02:46:14 MEZ
   Owner ID = 0xffffff800b664000
   Level = 255
   Assertions Set = None (4)
* Kernel Assertion ID = 501
   Created At = 01.01.70 01:03:21 MEZ
   Modified At = 01.01.70 01:00:00 MEZ
   Owner ID = 0xffffff800b674000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 502
   Created At = 01.01.70 01:05:31 MEZ
   Modified At = 25.12.11 02:38:13 MEZ
   Owner ID = 0xffffff800b704200
   Level = 0
   Assertions Set = None (32)
Any ideas? I tried resetting the SMC, to no avail. Thanks in advance!

here you go -- and thanks again.
Last login: Sun Dec 25 19:24:05 on ttys000
Pavels-MacBook-Pro:~ pavel$ kextstat -kl | awk ' !/com\.apple/ { print $6 $7 } 'Pavels-MacBook-Pro:~ pavel$ sudo launchctl list | sed 1d | awk ' !/0x|apple|com\.vix|edu\.|org\./ { print $3 } '
Password:
com.google.keystone.daemon
com.barebones.textwrangler
com.barebones.authd
Pavels-MacBook-Pro:~ pavel$ launchctl list | sed 1d | awk ' !/0x|apple|edu\.|org\./ { print $3 } '
com.culturedcode.thingshelper
com.google.keystone.root.agent
ws.agile.1PasswordAgent
com.valvesoftware.steamclean
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/Library/Components:
/Library/Extensions:
/Library/Frameworks:
AEProfiling.framework
AERegistration.framework
AudioMixEngine.framework
NyxAudioAnalysis.framework
PluginManager.framework
TSLicense.framework
XSKey.framework
iLifeFaceRecognition.framework
iLifeKit.framework
iLifePageLayout.framework
iLifeSQLAccess.framework
iLifeSlideshow.framework
/Library/Input Methods:
/Library/Internet Plug-Ins:
Disabled Plug-Ins
Flash Player.plugin
Flip4Mac WMV Plugin.plugin
JavaAppletPlugin.plugin
Quartz Composer.webplugin
QuickTime Plugin.plugin
flashplayer.xpt
googletalkbrowserplugin.plugin
iPhotoPhotocast.plugin
npgtpo3dautoplugin.plugin
nsIQTScriptablePlugin.xpt
/Library/LaunchAgents:
com.google.keystone.agent.plist
/Library/LaunchDaemons:
com.apple.aelwriter.plist
com.apple.remotepairtool.plist
com.barebones.authd.plist
com.barebones.textwrangler.plist
com.google.keystone.daemon.plist
/Library/PhonePlugins:
Nokia_5230_isync_plugin_2v0.phoneplugin
/Library/PreferencePanes:
Flash Player.prefPane
Flip4Mac WMV.prefPane
Growl.prefPane
Perian.prefPane
/Library/PrivilegedHelperTools:
com.barebones.authd
com.barebones.textwrangler
/Library/QuickLook:
iWork.qlgenerator
/Library/QuickTime:
AC3MovieImport.component
AppleIntermediateCodec.component
AppleMPEG2Codec.component
Flip4Mac WMV Advanced.component
Flip4Mac WMV Export.component
Flip4Mac WMV Import.component
Google Camera Adapter 0.component
Google Camera Adapter 1.component
Perian.component
/Library/ScriptingAdditions:
/Library/StartupItems:
Library/Address Book Plug-Ins:
.DS_Store
AdiumAddressBookAction_AIM.scpt
AdiumAddressBookAction_ICQ.scpt
AdiumAddressBookAction_Jabber.scpt
AdiumAddressBookAction_MSN.scpt
AdiumAddressBookAction_SMS.scpt
AdiumAddressBookAction_Yahoo.scpt
SkypeABDialer.bundle
SkypeABSMS.bundle
Library/Input Methods:
.localized
Library/Internet Plug-Ins:
.DS_Store
Picasa.plugin
Library/LaunchAgents:
com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.FA1728C5-B917-44F7-90CD-921 9143D5B9B.plist
com.apple.FolderActions.enabled.plist
com.apple.FolderActions.folders.plist
com.valvesoftware.steamclean.plist
ws.agile.1PasswordAgent.plist
Library/PreferencePanes:
.DS_Store
Hazel.prefPane
Library/ScriptingAdditions:
.DS_Store
TextExpander Addition.osax
Library/Services:
.DS_Store
Combine PDF pages.workflow
GraphicConverter.service
Mail selected items.workflow
New PDF from Images.workflow
Resize images.workflow
WordService.service
selected to Bean.workflow
Pavels-MacBook-Pro:~ pavel$

MBP Won't Sleep automatically. Sleep light on. Not pulsing. Drive spinning.

I can get my new MBP SR to sleep when I tell it to but it won't sleep when it's supposed to according to my Energy Saver preferences.
Instead of sleeping, the screen goes dark and the sleep light stays on at medium - no pulsing. I can hear the hard drive still spinning. I tried changing my screen saver to one of the original Apple settings (Computer Name) but that didn't help. I'm going to try throwing away my Energy Saver prefs.
Any suggestions?
BTW - I took a closer look and I was a bit surprised at how many posts there are for the MacBook Pro on the Apple.com discussions. The most posts per day of any model by far. I know its a very popular Mac but this model seems to have more problems than we are able to solve. That worries me. Anybody else noticing this?
-Todd

I had exactly the same issue and needed three hours to find out the reason. It was the Bluetooth Mighty Mouse. I had to disselect the *third option* in the *bluetooth preferences*. I have a German-language OS X so I don't know the exactly expression but it affects the ability for bluetooth devices to weak up the system.
If you have EyeTV 2: This application must not be running. If you have scheduled recordings that doesn't matter it will record anyway: It will wake up the Mac - record the thing - go to sleep again.
I have several devices connected to the MBP: Three external enclosures with harddisk drives (2xFW800, 1xUSB without sleep function), EyeTV 610, speakers - all those things did not prevent the system for going to sleep. All those devices can be left attached - up and running. The FW harddisks will go to sleep the USB not.

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

New iMac won't sleep with internet sharing on

Less than 3 month old iMac (core i5) has stoppped being able to sleep when Internet Sharing is enabled. It took me a good while to narrow it down to that but I've confirmed that when Internet sharing is off, it will sleep as it's supposed to. When sharing is on though, not only will it not automatically sleep per the energy saver setting, it wo'nt even sleep when forced with the Apple command. The display will turn off, but the machine does not sleep. I can tell by the facts that my wifi access on my iPhone continues to run off the iMac, and the Caps lock on the keyboard remains lit. (Too bad the blinking LED is no more on the new iMacs).
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.
Any help is appreciated.
Thanks,
Jamie

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.

Aluminium iMac won't sleep automatically!!

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