Andrew Richards wrote:
So should I call my server and get them to reboot mysqld?
if you are on shared hosting I am afraid they are unwilling to do this because this will affect other users on the same server.
If you are sure you didn't change anything on the database details, it's okay too to discuss and ask your hosting first.
or you may try to create a new database user, assign it to your joomla database, and change your configuration.php with this new details too.