My MacBook Pro (early 2011) will not go to sleep

Very recently my MacBook Pro (early 2011) suddenly stopped going to sleep whenever I shut it or even when I manually put it to sleep. I went to my schools help desk and they suggested restoring the computer to factory settings. I did this, reinstalled Mountain Lion and the problem seemed fixed. Then I backed up my files and again the computer would not sleep. I put the computer in safe mode and the computer would fall asleep. Any ideas what this might be?

There is no output from that command line?   Maybe the pid changed.
I'll repeat what I am trying to find out...
1. You do a pmset -g on the terminal.
2. The output from that pmset should have a line that says "sleep 0 (imposed by n)" where n is some number.
3. The ps ax | grep n is supposed to display what the process associated with n is.
It's the output from step 3 that should indicate what is causing you not to sleep.
But speaking of sleep, that's where I am going.

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    I'll repeat what I am trying to find out...
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    But speaking of sleep, that's where I am going.

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