Sky digibox: "Telephone Line not connected"?

I cant seem to get any interactive services from my Sky digibox. Its a Thomson Skydgibox DSI 4212. It keeps displaying the error message above. I have checked all the cables whihc are fine and my telephone service provider says that there is no problem with the line This has only occured following a lighting storm ,on the 18 August this year. It seems to have affected the ethernet link on my pc/broadband connection to. Any help available.