Just received a Tomtom One for Christmas! Great present - unfortunately it doesn't seem to work. Each time I turn it on, it can't find a valid GPS signal. I have reset it numerous times - no luck. Tried different times of the day - day, night - cloudy, rainy and bright sun. I live in a remote area (MA coast) with NO tall buildings or trees. Very frustrated. Looking for advice - before I throw this out the window! Thanks