When troubleshooting, I assume that nothing works properly, so I would try other LAN ports and take the switch out of the path until the problem is solved. I would accept that remote connection as a test that the cable works though. I would also do another reset using a 30-30-30 HARD RESET
to insure that it is indeed reset. Hardware failure is my last answer, and I don't get there until I try everything at least three time.