Não foi possível conectar ao banco de dados!

PDOException: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO) in /home/ethacons/public_html/conexao.php:7 Stack trace: #0 /home/ethacons/public_html/conexao.php(7): PDO->__construct('mysql:dbname=au...', 'root', '') #1 /home/ethacons/public_html/index.php(2): require_once('/home/ethacons/...') #2 {main}
Warning: Undefined variable $pdo in /home/ethacons/public_html/index.php on line 5

Fatal error: Uncaught Error: Call to a member function query() on null in /home/ethacons/public_html/index.php:5 Stack trace: #0 {main} thrown in /home/ethacons/public_html/index.php on line 5