Magento: white screen, 404 errors

Magento: white screen, 404 errors

add to index.php

ini_set('error_reporting', E_ERROR);
register_shutdown_function("fatal_handler");
function fatal_handler() {
    $error = error_get_last();
    echo("<pre>");
    print_r($error);
}

via: https://stackoverflow.com/questions/4784117/magento-how-to-debug-blank-white-screen