Had a look this afternoon.
Swopped Sata cables and ports, still nothing.
Even fitted the other drive internally and removed original.
Still nothing.
Normally in bios when you choose boot media its named, under this shit bios it's all generic.
Generic hard drive, generic CD etc
System shows original HD in bios and showed the other one I added in too.
Has me stumped. Will drop a copy of windows 10 round tomorrow so he can have a go at repair.