I was trying to resolve a problem on my server's Plesk Control Panel with my WP DB. I changed the name of the server and all hell broke loose. This is the error message I got:
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?
Tell me what I need to do please.