If it's not showing in disk management but showing in bios i would assume it's down to a bios setting,
if it's not showing in bios I would think a cable/connection problem or the drive itself.
working externally.
not showing in bios.
not showing in disk management.
cables LOOK to be ok. ive re-seated them.
i would run it in a 3.5 bay but i wanted it to be 'pain free'!! lmfao
will test it now that way