Site migration and domain mapper problems?

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I work at a company that has multiple small websites. Initially they each had their own C5 installs and then we moved to one install using domain mapper.

We are migrating from Lunarpages to Dreamhost and I was able to get each of the sites with their own installs moved over fine but when I try to do the main install the test site on the new host gets nothing:

The website cannot display the page
HTTP 500
Most likely causes:
•The website is under maintenance.
•The website has a programming error.

The config file looks just slightly different than all the other files (there's just a couple extra lines). I'm guessing the problem is there although I'm not sure.

<?php 
define('DB_SERVER', 'mysql.alta-dev.com');
define('DB_USERNAME', '#####');
define('DB_PASSWORD', '#####');
define('DB_DATABASE', 'altaprojects');
define('BASE_URL', 'http://altaprojects.dreamhosters.com');
define('DIR_REL', '');
define('PASSWORD_SALT', '3T5yLPZ6K4lmb7RBvjJYUXVz8fhpOkEGtaxcgswn0ruFqeCMo1NiHAS9Q2IDW');
define('PAGE_TITLE_FORMAT', '%2$s');
define('PERMISSIONS_MODEL', 'advanced');
define('REDIRECT_TO_BASE_URL', false);
?><?php ?><?php define('DIRNAME_APP_UPDATED', 'concrete5.4.1.1');?>