Nuc6i7kyk built with Win10x64, 32GB ram, booting from Samsung 950 Pro M.2 in slot #1, latest drivers and bios updated as of July 1, 2016. Until July 6, everything I have done with the system has been problem free. Then I added a second Samsung 950. Installed driver. The system does not see this second 950 in Bios. Device Manager shows it installed; controller is installed. I cannot access this second drive to format and use it. Does anybody have a solution?