Hi, I recently tried to hard wire on a bench 12v power supply my WD TV. The original AC adapter states 12v 1a output. So I checked connectivity and found the center conductor is the 12v and ground is the outer conductor. When I wired this up correctly (or so I thought) The whole WD tv box smoked and it now toast.. what did I do wrong? And is there a better way to find out which wire is the 12v and ground?