These are the only things I know of to check...
1. In WMDV, Mobile Device Settings, Connection Settings-all boxes are checked?
2. On Mogule, Activesync, Connections, -box checked for Synchronize all PC's using this connection- USB
3.
- Open your Services list (Start->Control Panel->Administrative Tools->Services).
- Make sure these two services are started and are set to Automatic start up with delay: “Windows Mobile-2003-based device connectivity.” “Windows Mobile-based device connectivity.”
4. Have you tried a different USB cable? Have you tried it with any other computers?
Hope you get it figured out..until then, have you tried to Synch via Bluetooth?