can't use my garmin 550 1. i can't scroll or zoom on the screen with an accuracy or reliability. is this normal? is there a way to clean it? is the screen trashed and needs to go in for refurb? 2. after charging at AC outlet the splash screen showing rj garmin plugged into a computer stays on for a very long time. it is hard to know if this is draining battery and i have tried to power it down either the power button but this does not work. 3. anyone got a tutorial for getting gpx to the unit? i am now putting them on an 4 gb SD card with an SD reader in my mac laptop and using "Garmin" and "GPX" for file structure to put the files in. the card is not mounted i the desktop when it is in the garmin. then i put the SD in the unit. should this work?! i can't find them on the unit and had been using a 8gb card.