I have received a critical error message when I try to reach the message board I have setup for my site. Someone said that this is because the MySQL service is down. Could anythin else cause this problem? Here is the direct link to what I get: http://www.saved-bygrace.com/phpBB2/index.php
Make sure you've setup the hostname to be "localhost".. and that the database username and dbname are setup correctly. If you set it to access mysql from your domain (in the script) then mysql will refuse the conneciton. Use "localhost" instead.
And of course, make sure mysqld is running
Other than that I cannot say, there isn't enough information to figure it out