[PHP] PDO : pourquoi ça fonction pas ?

>?php

$connexion = new PDO('mysql:host='.HOST_MYSQL.';dbname='.BDD_MYSQL, USER_MYSQL, MDP_MYSQL);
		$q=$connexion->prepare('SELECT * FROM mp WHERE lower(pseudo_dest) = ?');
		$q->execute(array(strtolower($_SESSION['pseudo'])));
		
		var_dump($q->fetch(PDO::FETCH_OBJ));
		
		while($result=$q->fetch(PDO::FETCH_OBJ));
		
			{
	?>	
			
			<tr id="border">
				<td class="expediteur"><?php echo $result->pseudo_exp ;?> <span class="new"></span></td>
				<td class="sujet"><a href="index.php?page=mp&idm=<?php echo $result->id ; ?>"><?php echo $result->sujet ;?></a> </td>
				<td class="date">le <?php echo date('d/m/Y', $result->date_envoi);?> à <?php echo date('H:i', $result->date_envoi) ;?> </td>
				<td class="delete"><form action="index.php?page=voir_mp" method="post"><input class="button" type="submit" value="Supprimmer"/> <input class="button" type="hidden" value="<?php echo $result->id ; ?>" name="id"/></form></td>				
			</tr>
			
		</tbody>
		<?php
			
			
			}
			$result->closeCursor();
		}
		
		?>