parked domain blank page issue

HI all

I have built a worpress website on http://www.domainname.co.za and the owner
also has a parked domain at http://www.domainname.com which should point to the co.za site. however, when i load the .com site i just get a blank page. when i view the source of the blank page it shows:

<?php
/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define('WP_USE_THEMES', true);

/** Loads the WordPress Environment and Template */
require('./wp-blog-header.php');
?>

so it looks like its pointing to the correct file but not loading anything. i have a tried to search for this issue but have not found anything that seems to match this problem. does anyone have any experience with this that could help?

thanks!