My TomTom now won't switch off. Earlier this week it just went blank, then when I tried to restart I got the drum noise and logo screen then I got a black screen with white writing. The TomTom now wont switch off, the online website connection is telling me there ins no device detected. Has anyone ever had this problem? Do I throw this TomTom away? Or can it be salvaged somehow? I'd appreciate any suggestions or advice anyone can please advise.