So I woke up at 6-7am and went for a run and when I came back I turned my computer on and I got a message saying, No Bootable Device And Press Any Key.............. I force shutdown then power back up holding the option key and I select my Macintosh HD Startup disk and then it boots into my OS. The message didn't make me feel warm inside so I need some help. Anyone? Oops Misspelled No with Bo. Sorry Lol.