What version is your DVD, and what color? I can't quite remember, but I think my old 05 had an orange 1.4 DVD or something like that. If that's the case for yours, I still have a custom navi disc I made that will reload the software and show a different start-up image. I could rip the disc and give you an .iso file for you to burn to your own disc. Whether or not it will work, I have no idea. It may be that your disc is shot. At least my custom disc will be able to reload the software, though.
I need this in my life!