It's nothing to do with privileges.
Quote:This occurs when you are using MySQL and the database password is incorrect in ./inc/config.php. To fix this, open ./inc/config.php and check the entry for $config['database']['password']. If you do not know what needs to be here, contact your host provider.
http://wiki.mybb.com/index.php/Help:Comm...r_Messages
i can't change my password from phpmyadmin or another edit file
I also tried export my old DB from phpmyadmin into new DB but it' show me error
#1062 - Duplicate entry '0' for key 1
DB works images missing now