Hello, Sorry you're having problems. Please press and hold that reset button for a full 10 seconds with the Magellan plugged into the computer, then release the reset and wait a full minute to see if you can get any response from the screen. Try that up to three times and let me know what happens please.
If you need further assistance let me know. Before you go, PLEASE DO click at least a 3 STAR RATING, at the top of your screen. That is how I am credited for my efforts by the site. You can follow up any time as needed at no additional cost.