WordPress database connection error

I have just installed a clean version of WordPress on my site and am getting an Error Establishing Database Connection message. I have checked the wp_config file and, as far as I can see, all seems to be correct.

This is the precise message:

Warning: mysqli_real_connect(): (28000/1045): Access denied for user '‘markatel_gmateli'@'localhost' (using password: YES) in /home/markatelier/public_html/wp-includes/wp-db.php on line 1489

Warning: mysql_connect(): Access denied for user '‘markatel_gmateli'@'localhost' (using password: YES) in /home/markatelier/public_html/wp-includes/wp-db.php on line 1515

Warning: Cannot modify header information - headers already sent by (output started at /home/markatelier/public_html/wp-includes/wp-db.php:1489) in /home/markatelier/public_html/wp-includes/functions.php on line 3592
  Error establishing a database connection'

Any help much appreciated.