No response when touching screen

sounds like the digitizers(touch screen) is out
you can get it repaired, here

or contact magellan at the Numbers listed below.

if you need further help, just let me know.

bill
For US and Canada - by phone

You may ask a technical support question or request a repair and get a Return Authorization (RA) number by phone. An RA number is required prior to shipping your product to Magellan for repair.Hours: Monday through Friday, 6:00 a.m. to 5:00 p.m. PST/PDT
Telephone: 800 707 9971