All files white - problem not with settings

I got s trange problem (and yes, I have searched).

I can't access any of the forum files. They just turn out white.
But it's nothing wrong with the database, since I got a "backup" server with almost the same files (connecting to the same database) and there it works perfect.

I guess I can add the config.php file:

<?php

$db_type = 'mysql';
$db_host = 'mysql.hosted.servetheworld.net';
$db_name = 'databasename';
$db_username = 'username';
$db_password = 'password';
$db_prefix = '';
$p_connect = false;

$cookie_name = 'punbb_cookie';
$cookie_domain = '';
$cookie_path = '/';
$cookie_secure = 0;
$cookie_seed = 'cd721ac9';

define('PUN', 1);

Anyone know what the problem might be? I don't feel like reinstalling since I got alot of plugins and such.

Yours, Runar