cookie_503

I get the “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. ” error message.
Guys from the IRC chanell tried to help me but no rezults:
-here is the wp-config.php file:
define(‘DB_NAME’, ‘SAVEFULGA_lx_ro’); // The name of the database
define(‘DB_USER’, ‘SAVEFULGA_lx_ro’); // Your MySQL username
define(‘DB_PASSWORD’, ”); // …and password
define(‘DB_HOST’, localhost); // 99% chance you won’t need to change this value
-on lx.ro(my host) it says
mysql database name: NAME_lx_ro
mysql database login username: NAME_lx_ro
mysql database login password: the password u choose when u signed in
mysql database host name: localhost
Can anyone tell what’s wrong?I would really aprrecite anyone’s help,thank u!