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I have had this problem before. You have to make sure you have the proper map data selected in Mapsource before you start selecting data to download to the GPS. I had multiple maps loaded into Mapsource but they weren't all unlocked for the multiple GPSs that I own. if I got the licenses mixed up between the units it wouldn't work. There should be a setting in your option menus.
Go to www.garmin.com, under Products > On The Trail, find your model of GPS (which version of Etrex), and on the far right under the heading "Quick Links", you'll see a link for the manual for that model of GPS.
I have an older Garmin 12XL and suddenly the screen turned very dark. I tried replacing the batteries and let the GPS rest for a week so the internal lithium battery could re-charge. But that did not work. I just got an email from a friend who had the same problem... it turned out that his unit had changed the screen contrast setting all by its' self. This may not be the cause of your problem but it's worth trying... go into your "Settings" menu and reset the contrast and see if that cures the problem. Good luck.