Try resetting your navigator by inserting a tin tool (e.g. unbent paper clip) into the reset port. A schematic can be found in the owner's manual. Also, ensure that the unit is securely connected to power or that the battery is fully charged. If these steps don't resolve the problem, return with the unit to the place of purchase to pursue service options.
Answers & Comments
Try resetting your navigator by inserting a tin tool (e.g. unbent paper clip) into the reset port. A schematic can be found in the owner's manual. Also, ensure that the unit is securely connected to power or that the battery is fully charged. If these steps don't resolve the problem, return with the unit to the place of purchase to pursue service options.