I receive this error after changing the user in my wp-config.php
I undo the changes and it is still appear. Please help!

Code:
Warning: mysql_connect() [function.mysql-connect]: Access denied for user 'dbuser'@'int.web6.vital.x10hosting.com' (using password: YES) in /home/dbuser/public_html/blog/wp-includes/wp-db.php on line 1036