Hi,
I had the same problem with my 2002 model.
Reading on forums I've noticed it is a common problem.
Many people replace it or took it to repair and payed over £250.00
In my case I had to drive abroad with work for about 4weeks so I had no time to do anything about it.
I left the dvd inside the whole time.
One day towards the end of my trip the sat nav started to work again.
Just like that.
I guess it could be luck but it is worth to try.
Best of luck.
Laurentiu
July 2008