So, I de-soldered the wires to the board. Re-soldered them to another NBv2.0 I had and it worked perfectly. ???
So it seems I have a short somewhere on the board either between 2 pads or a flick of solder has gone somewhere?
Luckily I have copper braid to remove the solder from the board, so I'll give it a good clean up and test it.
Thanks for the help people! Seems this issue is resolved...for now! >:D
I'll post with anything I see when I inspect the board under a magnifier. ;D