My mac pro wont start. I push the power button and I get a click sound. A few seconds later another click sound and that it.

My mac pro wont start. I push the power button and I get a click sound. A few seconds later another click sound and that it. I've tried different power plugs. Going direct into the wall, through a power strip. By iteslf, with other devices plugged in. I removed hard drives, and some RAM, and nothing. Sometimes it would not turn on, and then some minutes later it works. So its was sparatic, but now its been the same situation for three days where it wont turn on.
I'm guessing power supply, but I wanted to see if anyone had a similar expereince and what the solution was, before I drag this beast to my local Apple store and have them look at it. Its a real pain to get it there and back and I want to be armed with some info for them. I already dragged this to them when it first started to do this, and of course it started up just fine for them. And you know if it works for the Genius then theres nothing wrong with. No matter what you explain to them.
I figure if anyone had a the same problem and was able to resolve it, I can relate that experience to the Genius even if it start up for them.
Thanks

Try a SMC Reset using the extended method:
Remove the AC power cord.
Press the power-on button. [This drains the stored charge from the power supply]
wait a quarter minute.
Restore the power cord, being certain to JAM it into the socket, as the big block of rubber inhibits proper seating.
wait a quarter minute
attempt to power on.
If no joy, examine the button battery half-hidden behind the graphics card. Remove it to measure the Voltage. A new battery should not cost over US$5, and measures a little over 3 Volts. BR-2032 is used in garage door opener controls and car door locks controls. The geeks at Radio Shack can measure it for you.

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