Mountain Lion won't sleep

Since I installed Mountain Lion my computer will not sleep.  This appears to be a different problem from what others are experiencing.  Unlike what has been referred to on other threads, all items in my Apple menu (except Sleep) are functioning normally.  However, none of the normal methods (keyboard shortcut, Apple menu, power button, Energy Saver) will put my computer to sleep.  When I try to sleep the machine the only thing that happens is the cursor freezes on the screen, as though the only thing that has gone to sleep are the input devices.  Tapping the spacebar unfreezes the cursor and the machine functions normally. 
I have closed apps, removed peripherals, started in Safe Mode, reset PRAM, and nothing changes.  Turning the computer off to save power is not a realistic option in my workflow so, for now, I'm just burning the kilowatts whether I need them or not.  Any help would be appreciated.
8-core MacPro3,1

I'm on a MacPro and sleep did work when I installed ML but then out of the blue just quit.
The screen would go black but the system would not go to sleep (white LED stayed on full, touch a key and the screen lit right up, wasn't sleeping).  I tried everything, cleaned out all my preferences, went through all system preferences a dozen times, deleted a couple of apps that I had recently installed.. on and on and on, for days. I even reinstalled the update (that was already installed) OSX 10.8.2 overtop of itself hoping that would work out the kink.. Nada !
I could boot up from a separate bootable hard drive on my MacPro (holds 4) and it would go right to sleep, using every different command there was to put it to sleep but as soon as I switched back to my main system hard drive.. Nada !  I was just ready to run the terminal check (stated above) but was holding off cause I am not totally up on using it, have in the past but only once a couple years ago.
I even tried setting up a new user account and that wouldn't work either.  Then I saw one of the above posts that said they had print sharing turned on and that solved their problem.  I checked but I didn't have any settings of any kind turned on for sharing and I'm the only user of the machine.
THEN (don't ask me why), I remembered that a couple of days ago I got a warning from my Epson Wireless NX430 printer that I was low on black ink.  It still printed fine so I didn't change the cartridge, wanting to drain every last drop out of it because they cost so much.  So I sat there and said to myself.. I wonder.. No, it couldn't be.  So I went to my Epson printer and everything looked fine, it was in the sleep mode as it usually is when not being used.
I hit the power up button and lifted the cover to change the cartridges (decided to change the black and cyan since I was doing it as both showed low).  I changed the two cartrideges, closed the cover, the printer ran through its "charging cartridge" function.  I came back over to my MacPro and hit the Opt + Command + Eject key and my MacPro went right to sleep, didn't hesitate for one second, went to sleep mode and the white LED on the front of my MacPro went into pulse mode (instantly) showing it had shut down and was sleeping comfortably..
UN-FRICKIN BELIVEABLE !!!!!  Days wasted, programs trashed, clumps of hair on the floor ALL FOR NOTHING !!!!  Hope this helps somebody else so you don't have to go through this mess !!!!!!!!!

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