HP iPAQ hw6510 / hw6515

Central Florida/Cingular. I went to Michigan couple weeks ago, used GPS going from Detroit to St. Clair. Worked fine with both MS Pocket Streets and DeLorme Street atlas. Got back home/Orlando area, changed the map file to a local map for both programs, downloaded the 'quick GPS connection updates'-about 80 bazillion times, GPS will not connect to any satellites, won't get a fix in either program. Tried soft re-boot and taking battery out/putting back in, etc. Any thoughts?? Jim