Mac Pro Will only Load windows 7. Cannot get to Mac OS install boot

Ok so I've had this problem going on for sometime now. My Mac Pro will not load Mac OS. When I try the computer shuts down and I have to remove the HD that mac os is installed on. Then the computer will automatically boot into windows and i can reset the bootcamp auto load to windows. I was wondering if anyone here might know how to reset the hardware or firmware so that I can just wipe everything and install mac Os fresh.

The Mac OS drive has a corrupt directory most likely.
If you set the default OS to Mac OS X and pull Windows drive, what happens?

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