Why Power Button blinks after overnight ShutDown. Restarts Shuts Down?

Funny enough, My APC shorted out from another piece of equipment that went bad. Blew my room circuit breaker as APC smoke arose. Learned lesson, 'Dedicate your APC to your Computer(s) only! Testing showed I fried my Mother board! I bought and replaced the exact Motherboard version. Ran the 'Hardware Disk' all systems nominal, reset fan speeds. Hooray! Back in business!... 10 days later, I shut the Computer down. The next morning, the Power Button was blinking erratically. Not showing normal codes! Able to start up- fans, sys, monitors fine. Then, 'click', power supply shut off. Did the usual unplug power and peripheries, pmu, batt.. Time enough to run Hardware disk to know CPU, memory, drives,fans ok... Shut Down! BEFORE I GO TO REPLACE THE POWER SUPPLY, Are their any other thing I can check, i.e. Power Management, suspect Connectors, Power Button?? ANY IDEAS? PLEASE HELP! An Intel Mac Pro will be next but the changes and upgrades will put my Studio in Gremlin ****! THANK YOU!

>  think this is normal.  Any vaguely recent  think this is normal.  Any vaguely recent ...
Sorry - this is not normal...let me clarify....when I click 'Start' -> Shutdown -> select 'Shutdown' or 'Hibernate' from the drop down list, and press enter... It does shutdown or hibernate as appropriate, BUT IT ALMOST IMMEDIATELY STARTS BACK UP.  This is not normal behavior.  When you shutdown, it should indeed power off and stay off, until you press the power button again.  That is normal.
The last physical contact with the computer is pressing enter on the "Shut Down Windows" window...I do not close the lid, move a mouse, or anything else...I merely watch it shut down or hibernate, and start right back up...
Please note, I have attempted to search for a solution, but I don't know the 'specific' terms to look for...as shut down or hibernate doesn't fail, it succeeds, it just 'turns back on' or 'boots back up' as if a ghost pressed the power button to turn it back on....
My advanced power settings are set to:
When I close the lid - do nothing
When I press the power button - hibernate
When I press the sleep button - sleep (I never use sleep)
I am sure the power button itself is not malfunctioning, because when I press the power button in Win XP, it indeed Hibernates, (before starting back up)  If I 'shut it off during POST' and press the power button, it comes on as normal.
Any other guesses?

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