Go to the system menu:
On the menu bar (the top bar where it says System Settings) Tap left corner twice, right corner twice, left corner once, right corner once. It will bring up a hidden menu. The first thing on the hidden menu is reset for first use. Press that and you have done the equivalent of a hard reset. There is no hard reset button on that unit.
Once reset, make sure you have the latest firmware installed. Get that at the Magellan Web site.