Hi Sam_G. I've recently tried to repair a laptop, slightly older than yours, and which also had a power connector problem. This also isn't working properly after reassembly. In my case what has happened is that the connector pin is soldered into a "plated through hole". This is where there is a top circuit track as well as a bottom one, and the two are connected by electroplated metal inside the hole. The connector pin has damaged the electroplated metal so the top and bottom tracks are no longer connected. This can have unpredictable results depending on which areas of circuit are left isolated. If I'm right, the repair method I would (will) use is to pass a length of very thin wire through the hole and solder it top and bottom before fitting the connector.