You may have found the following link already. Your problem sounded familiar so I went over to the jinzora forum and found the following:
http://en.jinzorahelp.com/forums/viewtopic.php?f=1&t=3917basically either your user/password may have been modified accidentally or the sql daeman may not be running (check with "ps -ef | grep mysql".
it should be something like:
root 3265 3192 0 13:00 ? 00:00:00 runsv mysqld
smelog 3307 3265 0 13:00 ? 00:00:00 /usr/local/bin/multilog t s5000000 /var/log/mysqld
mysql 5296 3265 0 13:04 ? 00:00:01 /usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr --datadir=/var/lib/mysql --user=#deleted# --pid-file=/var/run/mysqld/mysqld.pid
root 5937 5902 0 22:00 pts/0 00:00:00 grep mysql
Have you done your yum updates and reboot?
just some thoughts to get you going...
Christian