2
Try to go to your frontpage and see if you can get to the admin.php page
http://www.yoursite.com/admin.php and in settings turn debug mode on.
If you cannot get to this page you can enter your phpmyadmin and do a query like this.
UPDATE xoops_config SET conf_value=1 WHERE conf_name = 'debug_mode'
And see if this page generates any errors
Programming is like sex:
One mistake and you have to support it for the rest of your life.