Power button issue Mac Pro 2.66

Mac Pro 2.66 is connected to a power strip I now notice that I do not have to press the power button to boot this Mac up. To boot it I need to just turn the power strip on WITHOUT pressing the power button and it boots right up. Only occasionally when I turn on the power strip its connected to I have to boot using the power button.
My question is what should I do here?
Isn't the power button part of the power supply?
If so can I repair the button or do I need a new power supply?
Anyone?
rd

Your Mac may "restart automatically after power fail" if that parameter is set in:
System preferences > Energy saver

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