I have a Garmin Montana 600. It gets used frequently. I turned it on yesterday and it fired up but the home screen was slightly shaking. When I touch the icons on the screen the screen shakes alot. It will not do anything else. I have shut it off and restarted it. I have taken the battery out and gave it overnight but no change. It starts up but the screen will not respond. I have even powered up with My finger in the top left corner to allow the reset button to appear but it will not respond. Any ideas of where to possibly get it fixed? Garmin no longer fixes the 600 and after telling their tech how it was reacting he suggested I buy a different one.