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I just found this site and i may be in the wrong kind of forum.This may be a dumb question. I just got my first gps. a nuvi 550. Straight out of the box it worked fine.The second day i use it the screen is black below 5 miles. Just the roads are visable. I installed the topo U>S> 24K from Garmin when i first got the gps. every thing worked fine the first day. Any ideas? Thanks in advance.