Check your error log:
$ tail -f /var/log/apache2/error.log
Make sure apache (php, Open-AudIT) can talk to your mysql process.
1. Check the mysql connection settings in include_config.php:
$ grep -e'$mysql' /{wwwroot}/include_config.php
2. Check mysql is running:
$ ps ax |grep mysql
3. Check port 3306 is not being blocked by a firewall, or php can find the mysql socket
$ grep socket /etc/my.cnf
socket = /var/run/mysql/mysql.sock
4. Check mysql module is installed:
$ cat /{wwwroot}/info.php
<?php phpinfo(); ?>
browse to:
http://myserver/info.php look for "mysql"
etc, etc, etc