Use an existing Drupal site to create a new site
Hmmmm, you that settings.php should be the ticket, but to really trouble shoot it, it would be easier to see the code. But because that contains your DB connection, that's not something that you should be sharing with others. However, if your having troubles, you could always try going about this a different way.

You could start with a blank db, and toss your settings.php file. That will cause Drupal to think it isn't installed yet, and will take you through the install process. Once your done with that and have a clean Drupal site running on a clean DB, then you can dump your data from your old site into the new DB, which should transfer your data over, but you'll have a fresh settings.php file. That might be easier way to go about it.