In your /home/dinorg/public_html/wp-content/themes/din/admin/qa_db.php something wrong. It is unusual that first line of a script will print something unless you opened php tag (or php shorttag) and put some codes in same line. So i guess that file may have something like BOM. Please open the file and see if you notice any weird characters.
if you are on server (terminal), you can use the file using vi (or vim).or you can open it using a file browser, if you have any control panel (like cpanel, plesk etc.). you can also download the file and upload to a file sharing site and attach the link in the comment so that we can see if the file has something wrong (if the file is publicly shareable).
to get error details rather than dead white page, please put the following in the /home/dinorg/public_html/wp-config.php.
ini_set('display_errors', true) ;
define('WP_DEBUG', true);
please let us know the outcomes.