Got this error:
Can’t select database We were able to connect to the database server (which means your username and password is okay) but not able to select the backbac2_wrdp4 database. Are you sure it exists? Does the user backbac2_wrdp4 have permission to use the backbac2_wrdp4 database? On some systems the name of your database is prefixed with your username, so it would be like username_backbac2_wrdp4. Could that be the problem? If you don't know how to set up a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.