garmin sat nav?

i recently bought a new charging lead for my nuvi 200 it isn't an original garmin product and when i plug it in, the sat nav powers up but it just stays on the same screen which has the word garmin with a little picture of a computer and a sat nav plugged into it. I have tried plugging my device into the pc, but it just says that there are no updates ready for my device. what is wrong with it help!!!

chris woodhead
August 2010