Joomla blank after changing server, admin panel good

I did a cPanel move of a Joomla 1.5 website and a PHPBB3 forum from one server to another, and when the DNS changes kicked in all I see is a blank page. The administrator panel works without any problems whatsoever. cPanel works. Website and forum (which is separate from the website) are both blank.

I have then manually downloaded and then uploaded all files (didn't move the databases manually), and some files wouldn't upload because of 555 file permissions. I changed the permissions to 777 temporarily to overwrite the file with the manually uploaded one. So all files are now the same as they were on the old server.

Even when I turn the Site Debugging on, the screen is blank.

There is no hidden index.html or default.html file which could be causing the problem.

The entire account was moved with cPanel so it's the same on the old server and the new server. The hosting provider reports no problems. The DNS changes kicked in two days ago.

PHP is working, as this link works: http://oklade.net/findpath.php

In configuration.php, there is nothing specifically pointing to the old site.

var $dbtype = 'WeboMySql';
var $host = 'localhost';