Something came in my mind: If you don't get an USB connection with your cable, try it with the battery inserted, that worked for me
And something else: did anybody experienced the problem, that solder got into the socket and plugging something in was impossible? (I used a lot solder, for a good attachment) That has broken at least two USB sockets for me, and I had a lot of work to get it off again.. After that I used a connector plugged in, surrounded with a piece of kapton tape. That worked, but almost broke my socket. Any better solutions?