MBP wont go into SLEEP mode!

Until the past week or so my computer will not go into sleep mode. It will black out like its going into sleep mode than after 3-5 seconds it will wake back up. This is becoming very irritating since I want to run my computer in 'clamshell' mode while I've been using my Dell external display.
Computer was fine for past 2 months up until about 5 days ago. If it makes a diff. i have an iphone hooked up with the update and I did the most recent MBP updates.
any help?????

I am having a similar issue with my new SR 17" MBP. it will shut off the display, and will appear to be trying to sleep, only to spring back to life. The only thing that makes a difference seems to be Airport. If Airport is off, the machine sleeps fine. if it's on, very rarely will it sleep. I also checked the console and keep seeing something about an "mdnsresponder error". It doesn't matter whether i try to sleep the machine by selecting sleep in the apple menu, using the power button, or closing the lid. They all give the same result.
Here's my thread that I posted a few days back.
http://discussions.apple.com/thread.jspa?threadID=1079305&tstart=210

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Well hello there, and welcome to Macintosh.
Unfortunately you can't change anything to stop this from happening. The shutdwn process goes about its business killing processes and applications that have been running. The sleep process interrupts ALL business going on in the OS, and puts the machine into low power mode, as it is not aware of the nature of the running processes (in this case, the shutdown process), knowing only that they must be slept and the machine dropped into sleep mode. You gotta wait it out before you close the lid.
I would suggest sending a message in OS X feedback requesting this as a feature!
If you find this response helpful or if it solves your issue, please click the appropriate icon in the header of this reply.

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MacBook Pro (late 2008) automatic boot, does not get into sleep mode

Good evening from Germany,
I have a problem with my MBP (5,1). Since last tuesday the MBP boots automatically after it had been shut down if the power chord is still attached to the MBP. As well when closing the lid it goes into sleep mode but after a couple of minutes it tries to wake itself resulting in lighting up the Apple logo on the back of the lid. After that it goes into sleep mode again and starts all over with the procedure ...-wake up-lid still closed-sleep-wake up-...
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Feb 28 18:12:01 mooxmacbook mDNSResponder[18]: mDNS_FinalExit failed to deregister service: 100831D28 mooxmacbook.rfb.tcp.se\.pieper.members.mac.com.
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greetings
flyingA

That's what I was guessing as well. But unfortunately there is no other device connected to the MBP.
Here's a list of what I've tried so far:
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- "com.apple.AutoWake.plist" in /Library/Preferences/SystemConfiguration/ deleted
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- fresh install using a Time Machine backup
Well thanks for the that but let's keep writing in English I guess that's easier for both of us.

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Mac Tower Pro 10.8.5 keeps going into sleep mode

Purchased from Apple, refurbished 2012 Mac Tower Pro. At the same time, purchased a new Dell U2713HM, 27" monitor.
Have been operating on this new system since about the first week of December 2013.
Issue:
The computer has constantly gone into sleep mode after a few minutes of no activity. I can have iTunes radio playing, but the system still goes into sleep mode. As I am typing and moving the curser, the machine stays awake.
This has caused much frustration because when it goes into auto sleep mode, it quits all programs that I am in, and when it does this, I lose all the work I had accomplished. It litterally closes everything and goes to sleep in about 2-3 minutes of no activity.
BTW: the computer and monitor have all its new OEM cables that came in the box, when I purchased the units.
Solutions attempted:
System Preferences — Energy Saver: computer sleep and display sleep set to "never" and unclicked the box "Put hard disks to sleep when possible."
Dell settings: Turned off all energy savers.
Results:
Nothing. Problem persists.

I apologize for the angst. The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost.
I misunderstood the terms of the warranty. Thank you for your input and patience. Much appreciated. For the benefit of others that experience this with a new Mac that auto shuts down. Check the following:
1. Go to System Preferences.
2. Click on Security and Privacy.
3. Click on Advanced (bottom right corner)
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MBP wont go into SLEEP mode!

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