Dropped my trusted and beloved Garmin 550 on a hard floor, and to my surprise it worked perfectly normally -- for about an hour, then while I was adding a 'via point' to my existing route, the screen shut down and I've yet to see any light whatsoever from the unit. I tried taking the battery out for an hour, put it back in with no action from the zumo. Likewise connecting it to its battery charger, and same-samie with connecting it to my computer. Tried pressing the lower right hand corner of the touch screen while messing with the power button with a variety of timing, but no soap. This 550 has been thousands of miles with me and the loss is tremendous. I assume its a send-in-for-service issue, but I figured I'd ask anyway, any ideas?