i have problem with my WP

some time this message appear to me

Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at localhost. This could mean your host’s database server is down.

Are you sure you have the correct username and password?
Are you sure that you have typed the correct hostname?
Are you sure that the database server is running?
If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.

now everything working good
and when this message appear i check another site on my serve and working by WP 3.4.1 and found another site work good
i don’t know where a problem
please tell me where a problem