PHP5 / MySQL problem on Linux Server -- Need Server Admin

I have a server that had the latest version of PHP 5 installed recently. PHP is functioning correctly, as is the MySQL database, but the pages are not able to connect to the database. We are currently migrating from a server running PHP4 to this new server. All of the files on the PHP4 server are able to access the database without problems. I need someone who knows LINUX SERVERS and is able to possibly recompile PHP5 with the correct MySQL settings. Please do NOT bid if you have limited knowledge of building your own webserver. This is very complicated and I've already had two admins who are unable to finish. All work will be done via root SSH.