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I can get to the screen where I can select whether to run Windows or Mac...however, when i select Mac, the computer "thinks" for awhile then reboots. I don't get the opportunity to log in.

I've Windows installed on my computer for over a year, and all of the sudden the other day when I went to start my computer it no longer boots into OS X. It acts as if it's going to, then the screen blacks out, reboots the computer and I can only log into Windows. Please help!