I've had this unit for a while and never had a problem before. When I launch Garmin Express, it does not recognize the unit being connected although the face of the Nuvi shows the connection icon and I get a file explorer window that opens after I plug the unit into the computer with the files on the Garmin.
I've rebooted the computer with no change. Removed and installed Garmin Express. Unit is charged and is plugged into a USB port on my laptop.