ini_set("display_errors", 1);
error_reporting(E_ALL);
This can have several reasons.
Please enable error reporting for PHP by setting the following commands right in the first two lines after the <?php in your index.php or Core Configuration file.
Then visit the page again.Code:ini_set("display_errors", 1); error_reporting(E_ALL);
Please make sure aswell that you installed URL Rewrite 2.0 in IIS and that your web.config is not broken.