Thanks, Josh! I just went back and re-edited "wp-config," getting the information from the web host control panel. I think it was correct, but I copied and pasted the info in anyway, and there has been no change in my situation: I have a new, blank installation of Wordpress, with only a sample page. But I seem to have all the plugins from my old installation, if that is a clue.
When I restored my new database from the backup of my old database, I had to try several times, as I kept getting the error "...the server went away." Eventually it seemed to work, but I don't know how to read the messages from phpMyAdmin or MySQL.
I can't seem to use the backup I made from within WP, because the Import plugin is looking for a WXR file (I think), and all I have is a .sql file.
Any ideas?