White screen now black screen on Maps and More Navigon70/71
Hi Just bought a VW Up. Nice little car. Not too impressed with Maps and more Navigon unit that comes with it. Thought I would plug it in to PC to check software up to date. Navigon Fresh found it for about 30 seconds then said device not found, screen went all white. Waited 5 minutes then did reset with button at base and holding down start button. Unit now completely dead! Any suggestions other tan taking it back to VW after xmas?