I know I posted this in the wrong thread. Dont know how to change it to correct thread??? anyway I just thought I'd share with you guys that I've just fixed my problem. I changed the mk3 nav unit for one I bought on fleabay for £100 from navman, plugged it in and it all works again!! everything lit up as it should drove around for 5 mins and nav found me and works perfect, I got a good deal coz he also sent me an 07 disc with splitscreen. Perfect! So in future if I ever have to disconnect battery I will make sure I let the nav power down as I'm sure thats what blew it!! doh
