Mac Pro Snow Leopard Display will Sleep but Computer will not Sleep

Equipment:
Mac Pro Tower
Snow Leopard 10.6.8
30" Cinema Display
The computer has not been able to fully go to sleep since I bought it. (A refurb, but not from Apple's refurb store.)
As the title says, the display goes to sleep but the computer is still on. (Whether I select Sleep from the Apple menu, or with a keystroke.)
"Wake for network access" is not checked in the System Prefs.
I've disconected everything (inc. the monitor) from the back of the computer and the computer still won't go to sleep.
Reset PRAM and the "System Controller (the move where you power down, unplug the computer, press/hold the powder button for 5 seconds, plug in computer and start up).
I installed the PleaseSleep and the DeepSleep apps, but still no-sleep.
From Console, for the Sleep command:
11/6/12 4:51:32 PM
configd[15]
Sleep: Success - AC - Software Sleep
com.apple.message.domain: com.apple.powermanagement.sleep
com.apple.message.signature: Success
com.apple.message.value: 1
com.apple.message.result: Success
com.apple.message.uuid: A3270153-6D75-4639-8125-3B105B537BCB
Then from when I touched the keyboard to "wake":
11/6/12 4:51:32 PM
configd[15]
Wake: Success - AC
com.apple.message.domain: com.apple.powermanagement.wake
com.apple.message.signature: Success
com.apple.message.uuid: A3270153-6D75-4639-8125-3B105B537BCB
com.apple.message.result: Success

"I was not able to use the system disks 'cos the image on the screen appears completly distorted and i am not able to navigate the menus."
Never ran across that type of problem on Apple's message boards.
"I have temporarily fixed that using a ten days trial version of SwitchRes X. Everything works fine now but the Display preferences panel from MacOs, wich stays "in coma"."
In that case, are you now able to boot off your install DVD? If so, run the +"repair disk"+ option, when done boot back to desktop & run repair permissions.
"So i guess it's not a hardware problem, but a Snow Leopard Problem."
Post in the Mac OS X v10.6 Snow Leopard Forums where the SL users hang out at.
!http://i50.tinypic.com/izvwo1.gif!

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