FreeMED cannot seem to connect to the database.
There are many reasons that this could happen.
The debug procedure is as follows:

1. Is MySQL installed? This needs to happen before anything else.
If you are using Redhat Linux then you need to install the MySQL RPMs.
Debian GNU/Linux users should type apt-get update; apt-get install mysql-server

2. There must be a database user who has complete access to the database that FreeMED will use. By default this database should be named 'freemed'.
This database must me accessable by this user.

3. In order to connect to the database three things need to set correctly: the database user, the database password, and the database location.
These values are configured in lib/settings.php.
If you installed FreeMED in the default location then you need to edit /usr/share/freemed/lib/settings.php.

4. In order to connect, the MySQL database must be running.
On Redhat you should type
service mysqld start
and then hit the enter key. You should see an 'OK'.