well have been using php-fusion for some time and usually have found solution to my problems in hear or google...
so the full errors text on web page is :
Unable to establish connection to MySQL
1045 : Access denied for user 'apache'@'localhost' (using password: NO)
and from log file
[Tue Jun 16 13:20:47 2009] [error] [client *****] PHP Warning: require_once(config.php) [<a href='function.require-once'>function.require-once</a>]: failed to open stream: Permission denied in /var/www/web31/web/maincore.php on line 57
[Tue Jun 16 13:20:47 2009] [error] [client *****] PHP Fatal error: require_once() [<a href='function.require'>function.require</a>]: Failed opening required 'config.php' (include_path='.:/usr/lib/php') in /var/www/web31/web/maincore.php on line 57
P.S sorry for my bad english but in this case i dont know what to do more and the config.php = 100% in order and the correct place ...
found solution ...