thanks to all for your respond, i spoke to magellan they said that my USB cable was faulty , they re supposed to send me a new one(cable) , whith that even when the unit is not plug the screen show me that its as power supplies and i have batteries inside , i think im gone to send everything back to the company and look for a other gps did someone can tell me what kind of gps is easy to use whit a big color screen im gone use it for geocaching and search for mushroom.
thanks marty.