blank screen on install

Here's what I've done:
1) uploaded xibo-server-1.6.2.zip to my webhost
2) unzipped the files
3) went to the path of the http://myserver.com/xibo
4) the page displays blank
5) index.php code below
Source:
<?php
/*
 * Xibo - Digital Signage - http://www.xibo.org.uk
 * Copyright (C) 2006-2012 Daniel Garner, James Packer and Alex Harrington
 *
 * This file is part of Xibo.
 *
 * Xibo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * Xibo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Xibo. If not, see <http://www.gnu.org/licenses/>.
 */
 DEFINE('XIBO', true);

// Include the Program Logic
include_once("lib/include.php");

?>

Thanks in advance for your help!