PDO errore PDOException' with message 'SQLSTATE[HY000] [1045]

[lucavalentino]

Sto tentando tramite PDO di conettermi al Mysql

$hostIn = 'localhost';
$dbIn = 'database';
$userIn = 'root';
$passwordIn = ' ';

    try {
        $MySQLDataBaseLink = new PDO(
            "mysql:host=" . $hostIn . ";dbname=" . $dbIn, $userIn, 
            $passwordIn);
        $MySQLDataBaseLink->setAttribute(PDO::ATTR_ERRMODE,
            PDO::ERRMODE_EXCEPTION);
        return $MySQLDataBaseLink;
        } catch(PDOException $e) {
            echo '<h3>
Catch Connect Error--->>> ' 
                . $e->getMessage() . '
</h3>';
          return false;
        } //End Try Catch
 // End connectToMySQL() function 

ma mi da questo risultato Catch Connect Error--->>> SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES)

Per il tutto uso Xampp 1.8.1 (Apache 2.4.3, MySQL 5.5.27, PHP 5.4.7)