Try resetting the unit. Remove the faceplate (there is an indentation at the top) and press the Reset button on the right side of the unit. If this does not help, there is a Master Reset, but it WILL ERASE ALL OF YOUR FAVORITES. If you have to do this, press and hold the bottom right of the screen and press the power button until the unit resets.
SOURCE: The screen on my Garmin Street Pilot C340 is frozen
I read the manual. There is a reset button underneath the plastic cover surrounding the screen (pry off w/ your thumb) -- push the reset if the power can't be turned off otherwise.
Testimonial: "Perfect!"
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