Nothing at all no phone or satnav or cd changer nothing just a blank screen. Get the initial screen, there's power, satnav disc spins and then screen goes off. There are also no lights on the unit when sidelights are switched on. No fuses blown and nothing else apparently wrong. The only difference being that yesterday it was driven all day switched off which it never is. Read on the forum to try disconnecting battery. Switching on and off ignition and starting engine with fuse out. About to try that but if any one has any other ideas all welcome.