I just got this unit from amazon. Everything was fine until today, when all of the sudden, the screen got stuck at the tomtom logo and it keeps coming back to the logo. Furthermore, it does not connec to the computer at all. What can I do? I have tried doing a soft start but that does not work either. When it is connected to the computer, the computer keeps beeping every 30 seconds as if it were connecting but then disconnects. Any ideas?