hello!
I have the same webhost (brinkster) and problem: when I try to load/run the install.php file in the browser, I get the same “Error establishing a database connection”.
I checked my entry in the wp-config file letter by letter times over, and it seems alright.
<?php
// ** MySQL settings **
define('DB_NAME', 'unlingual'); // The name of the database
define('DB_USER', 'unlingual'); // Your MySQL username
define('DB_PASSWORD', 'correctpassword'); // ...and password
define('DB_HOST', 'mysql6.brinkster.com'); // 99% chance you won't need to change this value
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');
However I never did anything in the “database manager” section of the web-based control panel,( nor do I know anything about handling databases and appropriate software) ; I only opened the manager and saw a MySQL database (named by my username: “unlingual”) standing there.
If anyone has had a similar problem or has an idea how I should start solving this, all help would be greatly appreciated!!!