Before I send my 550 off to Garmin for repairs, is there anything I can do to try and clear a problem with the touchscreen on the unit? None of the screen functions work. All of the normal pushbuttons function, but you can't select any options on the screen. When it boots up (first pic), the "View Map" button is highlighted. Pushing on "Where To" or anywhere else on the screen will temporarily highlight it until you let go of where you selected. If you use the selection pushbutton on the left side of the unit to make screen selections, it will scroll through normally. However, when you get to the map page (second pic), the Menu button on the screen does not work, and I notice that the biker is permanently highlighted. Is there any thing I can try to fix this? I did the usual "pop the battery out and try again" method, but that didn't fix it.