Why won't my Mac Pro wake up?

If I put my Mac Pro to sleep, it will not wake up normally. That is, tapping on the space bar, or moving the mouse, do not wake up the computer. I have to press on the power button for a few seconds, listen for the click. (so, manual shut down) Then I press the power button again, and the computer starts up.
Also, shut down though computer prompts is not sufficient. I ALWAYS have to use manual shut down to be effective.
I've talked to apple support a lot, no solution. I brought my Mac Pro to the apple store today, they thought they'd identified the culprit: My wacom tablet.
At the store, with no Wacom tablet, the computer did wake up from sleep-- I think. It definitely started up normally after a computer prompted shut down. (I mean a shut down achieved with the command under the apple logo on the computer...
But when I brought the computer back home I had the same problem, even when it wasn't connected to my Wacom tablet.
Other thing: If the computer is asleep and I un plug it, then plug it in again to power strip, it will wake up! So is it possible that I'm not getting enough juice coming into my computer?
Thanks, if anyone has any ideas I would be glad to hear them.

You need to plug the keyboard into a USB port on the chassis to have the Startup "snag keys" be recognized as well.
The USB ports on the keyboard only has enough power for ONE low power mouse. Do not plug anything else into those ports, not even a Flash Drive.
The mouse down/up scrolling default is the iPhone direction. You can change it with a checkbox in System Preferences > Mouse

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Mac Pro
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Original Mac OS X included
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Later Mac OS X included
(see Tip 1)
Mac OS X Build(s)
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Dec 2013
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