Recently updated cMP to sierra and wanted to load windows over a corrupted boot camp/Win7 drive. I downloaded the Win10 ISO and was able to burn it to dvd. *using the academic 64-bit version. The USB option is not available to me in Boot Camp. No problem-I'll just boot off dvd. BCA seems to recognize the dvd because if it's not in the drive it won't let me proceed to formatting the destination drive. (It will give a missing win installer message). After formatting it reboots and that's where I'm stuck. What I've checked: 1.) Downloaded the ISO twice to verify and they're the same size (3.91 GB). 2.) Reset PRAM and SMC 3.) Verified/repaired all drives 4.) macOS up to date 5.) firmware up to date 6.) Tried "C", "option", and "option-command-shift-del" combos multiple times on boot 7.) set startup disk to optical drive 8.) tried 2 different Win7 full install DVDs - won't boot either The windows disc icon does show up on boot screen but it's useless. After selecting it goes blank screen and just sits there and dvd spins down. Nothing happens and I have to reboot with "option" to OS X boot drive. It just doesn't want to boot off the optical drive. So, I can't install Win7 or Win10 anymore?!?