So I want to install my new SSD. I have an iron side certified 120gb ssd. And I’m installing a 970 evo plus m.2, when I install it it tells me to select proper boot device or insert boot media. When I go into bios I see my 970 evo and my 1tb external hard drive but I don’t see my old 120gb SSD. Therefore my system will not boot up because my operating system is on my ssd. Should I clone my ssd onto my hard drive or am I missing a step so that my old SSD still boots. Thank you for your time