Hello @kartik,
I had a problem with the white screen after installing a new larval instance. I couldn't find anything in the logs because (eventually I found out) that the reason for the white screen was that app/storage wasn't writable.
In order to get an error message on the screen I added the following to the public/index.php
try {
    $app->run();
} catch(\Exception $e) {
    echo "<pre>";
    echo $e;
    echo "</pre>";
}
Hope it helps!!
Thank You!!