I have a very old Magellan GPS 3000 that is having an issue that I think might be fixed by resetting it but I can't figure out how to do that. When I put batteries in it and then push down the battery cover it automatically turns on. It searches and is able to figure out where it is but the displayed date is wrong (1997) and none of the buttons work. I know it's old and I should just throw it away but I'm having trouble giving up on it. Can anyone help?