Hi all this is my first post so sorry that im asking for help already,not long bought vectra cdti 150 bhp and the alternator packs up ! I replaced it but somehow its knaketed the sat nav,stereo works fine and cd player too but no sat nav,a guy had quick look at it and said thinks its blown the board but not sure if that right or not,anyhow does any one know if these can be repaired at all.just to add the display screen is fine and when i turn the dial over to sat nav i get a blank white screen. When on radio it displays all imfo on staion and so on.thanks,carl.