My 850 EVO is not showing up in my Boot Priority list in UEFI. This is not necessarily a problem. I have been booting into my OS ever since it was reinstalled a few days ago. But I just find it odd how only my DVD Drive and Caviar Blue are showing. However, it does come up in the Boot Menu. Kind of funny.
What motherboard are you using? Is there a Hard Drive BBS Priorities list? That's where it should be.