I have a TomTom Go 710 which was supplied with my SEAT ALTEA, and I have a hard-wired dashboard cradle.
It runs with Navcore 7.903, I have since tried to upgrade the Navcore to 9.xxx and all goes well, until I connect it to the cradle in the car. It powers on then goes thru start-up then powers-off immediately.
If I connect the 710 to a cradle on the windscreen and connected to the cigarette lighter then it works just fine !!!!