The config.inc.php file is in simple plain ascii text.
So if it is hosed that would be the starting point then.
The first several lines are the most important to get running again.
Then look at all the other lines that have a url like the sessions.

It is not uncommon to loose that file and it becomes a 0 byte file.
So review it all.
The most common approach usually is to edit enough to get the site working.
Then review every item in the ubb cp and save even if it looks correct.

If truly there have been no changes you could use a backup file.
Ftp it up to the site.or edit the existing file with a simple editor like notepad that does not add any formatting.

Usually when the config file gets hosed the first error is can't connect to the database.
So it is a odd error to see what you have received.

Last edited by Ruben; 05/07/2014 3:57 PM. Reason: Added Comment

Blue Man Group
There is no such thing as stupid questions. Just stupid answers