My Mac Pro tower won't wake up

I have a Mac Pro tower, 2.66 GHz Quad-core Intel Xeon, running OSX 10.6.8, with 8 GB of RAM.
Recently it has taken to not waking up from sleeping, causing me to manually shut down and restart. When it does come back, instead of starting up, it goes back to the point where it fell asleep. I see a ghosted image of the screen saver, and then back to the desktop. When I shut it down and am ready to start up again, its the same problem. I hear a click, but no light comes on, and I have to hold in the power button until it goes silent and then wait a few seconds and press the button again, and this time it starts up ok.
I have restarted, run my disc permissions, updated the operating system, the problem still persists. I am at a loss, I paid a lot of money for this machine and its only 3 years old

I tried this experiment again, a cold restsrt worked fine. I then left it to sit overnight and tried to restart in the morning. The same problem: I hear a click, and the it goes off without the power light coming on. I have to hold in the power button for about 30 seconds and then it seems to reset itself.
Any sggestions would be helpful. thanks

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The great jurist Sir Edward Coke, who lived from 1552 to 1634, has explained why the term mortgage comes from the Old French words mort, "dead," and gage, "pledge." It seemed to him that it had to do with the doubtfulness of whether or not the mortgagor will pay the debt.

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My Mac Pro tower won't wake up

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