WSOD or white screen of death and error reporting

Sometimes you will have a WSOD and nothing to show for. One simple solution to get what is a problem is to insert the following lines into the Drupal's index.php, that should set PHP to report all errors.

ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);

and you will probably see that some module is making a problem, so you can fix it or disable it.