Hi all, I know this is probably mentioned somewhere else, but when I had the problem I couldn't find a direct answer anywhere. So thought this may help someone with a similar problem. When I bought my new Vectra this month, I had a small problem with the CD70 Navi. Everything worked great, sat nav & everything, but when I went onto the map or arrow display, all that was shown was a black screen where the map should be. After mentioning this to the place I bought the car, they had no idea why this was. After some searching on the internet, I found that the RGB cable between the CID and Headunit only displays the graphics used for the satnav, so I removed the display and alas..the RGB had come free from the back of the screen. I plugged it back in and tried the map display again and everything was fine! I know this is probably an obvious fix for the majority of people on here, but thought it may help those of us that don't know quite so much!!