yes,,,hav u installed the sony ericsson PC suite properly ?if u havent then first install the pc suite,,if it is already installed then try to uninstall and install it.sometimes my K550i also shows the same problem.also try to clean the fast port connector with alcohol ,sometimes due to rust formation this happens and it may be also due to loosening of the fast port connector.
p.s. Nice to find a girl out here and happy to reply
