Hello, I recently purchased a Mark III that came with 3 controllers. One of them did not work. I took it apart and nothing looks out if the ordinary. I cleaned it and polished the contacts. The only other things I can think of is the cord is bad, the db9 connection is faulty, or I need to resodder the wires on the pc. All the wires are seem to be soddered and not loose. What should my next move be? I was aware the controller was broken when I bought the Mark III. Thanks for all the help.