При установке друпал вылезает такая ошибка:

In order for Drupal to work, and to continue with the installation process, you must resolve all issues reported below. For more help with configuring your database server, see the installation handbook. If you are unsure what any of this means you should probably contact your hosting provider.

Failed to connect to your database server. The server reports the following message: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO).

Is the database server running?
Does the database exist, and have you entered the correct database name?
Have you entered the correct username and password?
Have you entered the correct database hostname?