What about if you make a page with these lines of code:
require_once('global.php');
require_once('../Connections/PowerStoreConnection.php');
mysql_select_db($database_PowerStoreConnection);
?>
OK
error_reporting(E_ALL);
ini_set('display_errors', 'on');
I will try this when I get back to my office. I think it's more of a problem with the resource checking in the installation wizard than a connection problem.