ok I installed windows 10 using boot camp. followed the instructions as I have done a few times in the past with no problems. but now I cant reboot into OSX. the partition is still there... I can see it in disk management on windows but can not boot to OSX. It even shows OSX in the boot camp software on windows but when I select it and restart, it comes back to windows. holding option key does nothing. pressing X or C or any of the other things iv read online have worked. reset NVRAM too and still only windows. How do i fix the booting? the partition is still there but no boot. preferably DONT want to reinstall OSX.