I installed Windows10 on my Mac with bootcamp but I must have done something wrong because I cannot seem to boot into anything but Windows. I tried all the combinations of command-R, command-option-R, etc... that I could find. I was able to boot Windows into some recovery mode but not to be able to get back to OS X. As an alternative approach, I created a Linux boot stick but I could't get the computer to boot into that either. Any suggestions on how to boot into OS X or Linux would be greatly appreciated.