Hi, Can anyone help my Sat nav screen works with only heater radio info but not menu /satnav when trying Sat nav I get a black screen with vertical white/yellow lines, I have tried battery off, Sat nav boot reset, I have had readio and satnav screen out undone all connectors and re connected and no change. What do I do or change, will not pay new as have a UK/EU TomTom, any advice term served Lexus mechanics. I am after a Lexus Mechanic Stoke on trent area who does cash jobs please??? regards Kevin