Error establishing a database connection

hi,

I have a problem, i tried to edit the wp-config.php, but when open my page it got error started like this:error establisghing a database connection.

my wp-config.php is like this:
<?php
// ** MySQL settings ** //
define(‘DB_NAME’, ‘wordpress’); // The name of the database
define(‘DB_USER’, ‘zack’); // Your MySQL username
define(‘DB_PASSWORD’, ‘*******’); // …and password
define(‘DB_HOST’, ‘localhost’); // 99% chance you won’t need to change this value
define(‘DB_CHARSET’, ‘utf8’);
define(‘DB_COLLATE’, ”);

// You can have multiple installations in one database if you give each a unique prefix
$table_prefix = ‘wp_’; // Only numbers, letters, and underscores please!

// Change this to localize WordPress. A corresponding MO file for the
// chosen language must be installed to wp-content/languages.
// For example, install de.mo to wp-content/languages and set WPLANG to ‘de’
// to enable German language support.
define (‘WPLANG’, ”);

/* That’s all, stop editing! Happy blogging. */

define(‘ABSPATH’, dirname(__FILE__).’/’);
require_once(ABSPATH.’wp-settings.php’);
?>

What should i do now?