Originally Posted by BogeyMan
I noticed this weekend that my Montana 650 wasn't quite "right" - so I [tried to] perform a screen calibration [Setup/Display/Screen Calibration].
Now I get stuck in what appears to be an infinite loop, with the last step being a horizontal line across the bottom of the screen (regardless of orientation) with no dot to press, then it loops back to the start...
I've tried this both from the menu and a power-on reset.
Yes, as MBD suggest, call Garmin!
Also, if you can, take a photo with your smartphone etc and post here so we can see what the screen look slike when this happens?