Login system is not working on live server

HI. i m Building a small web application for users .But my login page not working on live server??
problem is that it work perfectly on localhost . As soon as i uploaded on live server login form not working and not giving me any error ??? Guys please help to sort out problem.

Try adding this line to .htaccess file

php_value output_buffering On

Still Not working by adding these line

What error do you get?