So I was trying to install windows 7 from an authentic CD on my 2013 macbook pro retina. Since my mb pro does not have an internal dvd drive, I was using my external dvd drive purchased from the apple store. I was running bootcamp and the installation seemed to be going well. Then at one point it said it needed to restart. Upon restarting, it starts up and then goes straight to a screen that says "No bootable device- insert boot disk". I've done some google searching and the only resolutions I've seen are to hold down the Option key upon startup, but this has not worked for me. Does anybody have any suggestions, resolutions, or comments regarding this issue?