I had the same problem with a Satnavi disc. I disconnected both of the battery cables, left them disconnected for 10 minutes, then held them together for about 30 seconds and then reconnected the battery. Putting on the positive (red) cable first and the negative (black) cable last. This seemed...

Well, I have been in contact with someone from Satnavi and explained my problem. They said to leave the disc in the Sat Nav for an hour or more on my next journey and "It will boot up". They have also arranged to send me a replacement disc in case this one is faulty. All positive, so we will...

I have the same problem with a SatNavi Land Rover option 3 upgrade for my Freelander 2