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The user name and the password of the database are probably different than it used to be...
for example, with one of my hosts, the user name is simply the username, but with another host, the user name is my login id for the service and the user name.
1st host: dbuser
2nd host: adrock_dbuser
same goes for the db password...
check any documentation your host may have on their phpMyAdmin set-up, or call them and ask for the correct format to use for the user and pass when accessing the DB
Good Luck! and happy xoopsing!