Tried all sorts and nothing worked. As I posted elsewhre, Kent Elms Citroen have diagnosed the ECU, apparently 3 parts to the system. ECU, CD player where the software CDs load and the screen. New ECU is £850+vat+fitting. Currently looking at Ebay also the local garage has a man who repairs ECUs for "a couple of hundred quid"!! So might yet go that route. By the way, new aerial and base, fitted is almost exaclty £100. Anyone know exactly where the SatNav ECU is hidden?????