Just installed a GTX 760 into my Mac Pro. It works great. I am concerned about the absence of a boot screen because I have Windows 10 installed via bootcamp & will need to use it now & then for gaming. I don't want to find myself unable to boot into OS X. Is this avoidable just using the bootcamp app to boot back into OS X or am I in danger of being unable to boot into anything except Windows? Thoughts?