Mac won't go to sleep

I've problems with auto-sleeping on both my MacBook Pro and iMac. They had the same issue in Snow Leopard and a update to Lion didn't fix the issues.
None of them is going into sleep automatically. On my MBP I've quitted all known applications from the "Activity Monitor" and from "System Perferences->Energy Saver" setting the computer to sleep after 2 min and black screen after 1 min. The screen is turning black after 1 min. but the computer never goes into sleep. It's the same situation on my iMac.
I found out that, when I'm changing something inside the "Energy Saving" and close "System Preferences", I get this log message in Console:
[0x0-0x4d04d].com.apple.systempreferences[3191] Couldn't find any matches.
Both on my MBP and iMac. My girlfriends MBP is not having this log message and auto-sleeping is working fine on her MacBook Pro.
I'm using MobileMe Sync on both my Macs. Maybe there is a conflict with some of the preferences which are in sync. I've tried to delete '/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist' and let the System Preferences recreate the file. Not working.
Other users is having the same issue:
https://discussions.apple.com/thread/2403924
https://discussions.apple.com/thread/2583012
I hope someone can help me with this issue. Please tell me if you need further information.

Triple-click anywhere in the line below to select it:
pmset -g assertions
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
Post any lines of output that appear below what you entered — the text, please, not a screenshot.

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After installing OC X Snow leopard my Mac won't go to sleep. unless I close everything out. It wasn't like that before the "upgrade". How do I fix it? Thanks

After installing OC X Snow leopard my Mac won't go to sleep. unless I close everything out. It wasn't like that before the "upgrade". I have looked at the Energy saving icon and everything looks OK. How do I fix it? Thanks

OK I solved it.
I followed instructions from http://superuser.com/questions/214943/what-is-preventing-my-macbook-from-sleepin g/409481/
Go to Utilities in the Applications folder and open the "Terminal" app.
Type pmset -g and hit Enter
If "sleep" has 0 next to it and the words "imposed by" or "prevented by ; The number next to the imposed by is the process ID causing the problem. Copy that number.
Type ps -e | grep <process ID here> and hit Enter. This will list all running processes that have that ID (will also include the grep process)
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Hi,
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I have issues putting my macbook to sleep in this configuration:
1. lid closed
2. connected to an external LCD monitor (via VGA adaptor)
3. power adaptor attached (100% Charged)
4. external keyboard and mouse (via USB)
Ive tried all the suggestions in the `If your Mac won’t go to sleep` Help file including:
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2. deselect “Wake for Ethernet network administrator access.”
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My macbook has no issues going to sleep when no cables are attached and I just close the lid.
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ok - it looks like it completes hibernating and sleeps and then immediately wakes up. I cant tell from the log files what is causing it to wake.
I do find the `network traffic reduction measures in effect` out of the ordinary and AppleTalk starting up and shutting down frequently suspect without researchin further...
11/15/07 3:25:31 PM kernel hibernatewriteimage done(0)
11/15/07 3:25:31 PM kernel sleep
11/15/07 3:25:31 PM kernel System Wake
11/15/07 3:25:34 PM kernel 11D beacon causing regdomain change to CC 702
11/15/07 3:25:34 PM kernel en1: 802.11d country code set to 'SG'.
11/15/07 3:25:34 PM kernel en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64 149 153 157 161 165
11/15/07 3:25:34 PM mDNSResponder[23] Note: Frequent transitions for interface en1 (192.168.1.xxx); network traffic reduction measures in effect
11/15/07 3:25:36 PM configd[34] AppleTalk startup complete
11/15/07 3:25:36 PM configd[34] AppleTalk shutdown
11/15/07 3:25:36 PM configd[34] AppleTalk shutdown complete
11/15/07 3:25:36 PM configd[34] AppleTalk startup
11/15/07 3:25:37 PM mDNSResponder[23] Note: Frequent transitions for interface en1 (FE80:0000:0000:0000:021C:B3FF:FEBC:xxxx); network traffic reduction measures in effect
11/15/07 3:25:37 PM mDNSResponder[23] Note: Frequent transitions for interface en1 (192.168.1.xxx); network traffic reduction measures in effect
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Mac won't sleep - Reason?

I am trying to figure out why my mac won't sleep.
I have run this command in the teminal (pmset -g assertions) and this is what I get back. If anyone can let me know what the problem is I would appreciate it. I have disconnected everything from the machine such as firewire, usb cables etc. But the computer will not sleep on its own. It does when I initiate it but not by the automatic function in energy saver pref pane.
Thx
Felix
mac-pro:~ felixbird$ pmset -g assertions
7/14/12 7:15:56 AM PDT
Assertion status system-wide:
   PreventUserIdleDisplaySleep             0
   CPUBoundAssertion                       0
   DisableInflow                           0
   ChargeInhibit                           0
   PreventSystemSleep                      0
   PreventUserIdleSystemSleep              0
   ExternalMedia                           0
   DisableLowPowerBatteryWarnings          0
   EnableIdleSleep                         1
   NoRealPowerSources_debug                0
   UserIsActive                            0
   ApplePushServiceTask                    0
Kernel Assertions: 0x0004
* Kernel Assertion ID = 500
   Created At = 12/31/69 4:03:23 PM PST
   Modified At = 12/31/69 4:00:00 PM PST
   Owner ID = 0xffffff802079e000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 501
   Created At = 12/31/69 4:03:30 PM PST
   Modified At = 7/14/12 7:08:33 AM PDT
   Owner ID = 0xffffff80207c7000
   Level = 255
   Assertions Set = None (4)
* Kernel Assertion ID = 502
   Created At = 7/14/12 7:05:04 AM PDT
   Modified At = 12/31/69 4:00:00 PM PST
   Owner ID = 0xffffff81a012c000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 503
   Created At = 7/14/12 7:05:04 AM PDT
   Modified At = 12/31/69 4:00:00 PM PST
   Owner ID = 0xffffff81a012f000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 504
   Created At = 7/14/12 7:05:04 AM PDT
   Modified At = 12/31/69 4:00:00 PM PST
   Owner ID = 0xffffff81a0129000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 505
   Created At = 7/14/12 7:05:16 AM PDT
   Modified At = 12/31/69 4:00:00 PM PST
   Owner ID = 0xffffff81a0145000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 506
   Created At = 7/14/12 7:05:16 AM PDT
   Modified At = 12/31/69 4:00:00 PM PST
   Owner ID = 0xffffff81a0148000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 507
   Created At = 7/14/12 7:05:16 AM PDT
   Modified At = 12/31/69 4:00:00 PM PST
   Owner ID = 0xffffff81a0132000
   Level = 0
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If it is'nt the card, this may help;
If your Mac happily goes to sleep but won't wake up--Hold down the power switch to force-reboot your machine and get it running again.
Don't worry-your Mac isn't narcoleptic. Its Open Firmware system or NVRAM (nonvolatile RAM) is likely corrupt, and your Mac can't remember how to wake up.
Restart your Mac and immediately hold down the Command-Option-O-F key combo until you see a somewhat intimidating command-line display that ends with the Open Fimware prompt. Type the following lines:
reset-nvram
press Return on keyboard
set-defaults
press Return
reset-all
press Return
Your Mac will reboot. Once it's running, put it back to sleep to test. If the problem recurs your Energy Saver preferences may be the culprit. Delete the com.apple.PowerManagement.plist file (go to Finder/Hard drive/Library/Preferences/SystemConfiguration)--don't worry, your Mac will regenerate a new one--and then restart to see if that rights the wrong.
Still did'nt work? Might be time to call AppleCare or see an Apple Genius or a technician.
Cheers!
DALE

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Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Terminal in the page that opens.
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Important: The name of your computer will appear in the output. If that information is private (for example, if the computer name contains your own name), edit it out by search-and-replace in a text editor before posting.

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Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
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Best.

My mac won't wake up from sleep, what can i do

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When you push the power button and that fan goes off is the machine now fully off? No power light? No fans spinning? Now drives spinning?
I don't recall what I did when my machine shut off with the one exhaust fan running. I think the obvious thing I would have tried would have been to push power button for 10 seconds to shut it down fully. That or actually pull the plug.
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Mac won't go to sleep

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