Page Cannot Be Found? Worked a few weeks ago, but not now?

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I don't really understand what happened.. Our site was up a few weeks ago when we had the Godaddy domain pointing to our host. Then, we had to switch it back because it caused a disruption on other websites..

Now, it has been working on the temporary address (including the IP address) but when I alter the site.php to have it display at 3dms.com, it doesn't work. I don't understand why because nothing changed.

Can anyone check this out please? Thanks!

http://www.3dms.com/

My site.php looks like this:
define('BASE_URL', 'http://www.3dms.com');
define('DIR_REL', '');