Im not an expert but start off simple. Unplugging wires and moving them generally is not the first course of action. If something was wrong that blew something now you move wire and blow another row up and have 2x as much to fix. First do you even have power at the pins on mobo? Could be something as simple as a cold solder joint. My course of action would be pull connector and check for power at pinson motherboard. If power at the pins swap multimeter to continuity. One lead goes into plug/wire that we think is bad other end goes to end of string. Do we have continuity? If no/low power at pins we first check for cold sodler joints. If these couple things dont work I would try to figure out what controls that row and replace it. Also have you looked up the system 11 repair bible? I was new to all this about 6 months ago and with some help from here and https://hansbalk.home.xs4all.nl/rep/sys11/index.html I "shopped/minrestored" a F-14 Tomcat