Have you tried to repair the database table?
Here I have several sites on "Joomla" who were working fine and suddenly stopped working. I think I have disabled the mysql Why? Or changed the settings of mysql?What kind of error do you get, and on what specific address?
I'm not seeing any active Joomla installs on the account you're posting from; ignoring for the moment that you're only allowed one account per person, we will need more information to be able to diagnose why you're unable to access MySQL - I have checked all 3 servers, and as of this moment all of them are showing MySQL is online and accessible (all are also functional for other users, as there are active database queries happening).
Edit: Half ninja'd.