Can you help me to solve this problem with my web site. I have an PHP Events Script and an error looks like this:

Warning: mysql_pconnect() [function.mysql-pconnect]: Access denied for user 'londoni_root'@'localhost' (using password: YES) in /home2/londoni/public_html/config.php on line 2

Warning: mysql_select_db(): supplied argument is not a valid MySQL-Link resource in /home2/londoni/public_html/config.php on line 5

Warning: mysql_query() [function.mysql-query]: Access denied for user 'londoni'@'localhost' (using password: NO) in /home2/londoni/public_html/home.php on line 88

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /home2/londoni/public_html/home.php on line 88

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /home2/londoni/public_html/home.php on line 90

My site has work properly but I had some problems with my bandwidth in my host, so I upgrate my host and this error start to show in my page. :(

Are you sure this is about Xoops? I don't have config.php and home.php at the site root. In any case, looks like the database user and/or password aren't correct in config.php, line 2. That's at least what it says.

Update the mainfile with your MySQL username and password. It cant connect because MySQL isn't accepting the login credentials.

Also, you dont need pconnect, so in your mainfile
set the following to 0:
define('XOOPS_DB_PCONNECT', '0');

thnx very much.
The problem was to root username and password.