okay in my config file I can't say for instance
$config['dbtype'] = "mysql";
$config['dbserver'] = "localhost";
$config['dbuser'] = "mysqluser";
$config['dbpass'] = "yaddayadda";
$config['dbname'] = "ubbthreads";
I have to say
$config['dbtype'] = "mysql";
$config['dbserver'] = "localhost";
$config['dbuser'] = "mhomedirectory_mysqluser";
$config['dbpass'] = "yaddayadda";
$config['dbname'] = "mhomedirectory_ubbthreads";
so I would look at your config.php in your includes directory and change the lines to
$config['dbtype'] = "mysql";
$config['dbserver'] = "localhost";
$config['dbuser'] = "efs_mysqluser";
$config['dbpass'] = "yaddayadda";
$config['dbname'] = "efs_ubbthreads";