garmin nuvi 300 - Screen freezes on external power

[blokester]

Hi
I have a Nuvi 300 which hasn't been used for a while. When I connect it to the 12 volt car adapter the screen freezes, the power switch stops working and a monitor screen and what looks like an upright freezer icon appear at the bottom of the display.
When the power is disconnected it appears to work fine.
Any ideas whats causing this?
Cheers

[PhilHornby]

[blokester]

Cheers
It is a garmin charger and worked a treat when connected to the cradle but used to work in my other car plugged in direct. thanks for the reply.

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