You say you installed a new default style to test and it didn't work. Then you say you revert the footer template in it and it still didn't work. A new default style should have no templates that you can possibly revert, so this doesn't make sense.
Have you tried disabling your plugins to see if they work?
To temporarily disable the plugin system, edit config.php and add this line right under <?php
PHP Code:
define('DISABLE_HOOKS', true);