take a look in Apache's log file

First you need to find the error, see laravel.log or php error log

[2015-01-28 07:01:18] production.ERROR: exception 'PDOException' with message 'SQLSTATE[HY000] [2002] No such file or directory' in /Users/tabutcu/Desktop/Larabook/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:47

That's the error in the laravel.log file.

Maybe it has something with the changes on the files structure.

Here is a guide to deploy a laravel 4 app on a cpanel type hosting

Here is the larabook folder it is under myapps/larabook

Here is public folder under the public_html

And here is my index.php file

<?php
/**
 * Laravel - A PHP Framework For Web Artisans
 *
 * @package  Laravel
 * @author   Taylor Otwell <[email protected]>
 */

/*
|--------------------------------------------------------------------------
| Register The Auto Loader
|--------------------------------------------------------------------------
|
| Composer provides a convenient, automatically generated class loader
| for our application. We just need to utilize it! We'll require it
| into the script here so that we do not have to worry about the
| loading of any our classes "manually". Feels great to relax.
|
*/

require 'ftp://[email protected]/my_apps/larabook/bootstrap/autoload.php';

/*
|--------------------------------------------------------------------------
| Turn On The Lights
|--------------------------------------------------------------------------
|
| We need to illuminate PHP development, so let's turn on the lights.
| This bootstraps the framework and gets it ready for use, then it
| will load up this application so that we can run it and send
| the responses back to the browser and delight these users.
|
*/

$app = require_once 'ftp://[email protected]/my_apps/larabook/bootstrap/start.php';

/*
|--------------------------------------------------------------------------
| Run The Application
|--------------------------------------------------------------------------
|
| Once we have the application, we can simply call the run method,
| which will execute the request and send the response back to
| the client's browser allowing them to enjoy the creative
| and wonderful application we have whipped up for them.
|
*/

$app->run();