arrange for it to be returned & repaired.
Reset the unit by pushing a bent paperclip or pin into the hole on the bottom marked 'reset' turn it back on, plug it in & charge it via USB overnight or as long as you can in the car, make sure the led on the top is green, tap the bottom right of the screen & check the battery symbol on the unit says charging underneath.
If this doesn't help.
contact them about the problem...
http://www.tomtom.com/support/support.php?ID=2
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