Visual editor not working

All I can use when working on a page or blog is use the text tab, when clicking the visual tab, NOTHING happens and I need it for someone who cannot use HTML.

I have the latest version installed 3.6.1 but this was a problem before the last upgrade.

Please advise ASAP Please!!!

I wanted to add that I changed theme to see if that helps and it works just fine with another default WP theme. So I know the problem is with the Pressa theme.

Also the add media button is not working as well.

I found the solution that worked for me

add the following lines near the bottom of the page:

define('SCRIPT_DEBUG', true);
define('CONCATENATE_SCRIPTS', false);

just before the line that reads: require_once(ABSPATH . 'wp-settings.php')