After leaving my flat for Christmas to go home, after I came back I tried to start my computer and my SSD now doesn't exist on my BIOS or my Boot options. My SSD contained my boot files etc, and my hard-drive was for storage so it cannot boot... I've recently made a bootable USB drive. And now are in the midst of using it. But when I tried to repair my system etc, it said there wasn't a problem, so has my SSD gone down? or should I reinstall windows to another hard-drive, and then log into that etc to find another way of repairing the SSD if it is just software?