This site perfectly works on localhost but online outputs 1 line empty source, dashboard and login works.

This is taken from server log (aruba.it)
[Wed Jan 08 12:15:21 2014] [error] [client xx.xxx.xxx.xxx] File does not exist: /web/htdocs/www.domain.it/home/favicon.ico

This is .htaccess

# -- concrete5 urls start --
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /parziale/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME}/index.html !-f
RewriteCond %{REQUEST_FILENAME}/index.php !-f
RewriteRule . index.php [L]
</IfModule>
# -- concrete5 urls end --

And this is site.php
<?php
define('DB_SERVER', 'xx.xxx.xxx.xxx');
define('DB_USERNAME', 'Sql000000');
define('DB_PASSWORD', '12345678');
define('DB_DATABASE', 'Sql000000_4');
define('BASE_URL', 'http://www.domain.it');
define('DIR_REL', '/parziale');
define('PASSWORD_SALT', 'xxx...');
define('LOCALE', 'it_IT');