installed nginx and php5-fpm on ubuntu server and then installed magento and i get white screen

installed nginx and php5-fpm on ubuntu server and then installed magento and i get white screen nothing else on it vertual host config

        listen 80 default_server;
        listen [::]:80 default_server ipv6only=on;

        root /var/www/example.com/html/html;
        index index.html index.htm index.php;

php config in it is

  location ~ \.php$ {
        #       fastcgi_split_path_info ^(.+\.php)(/.+)$;
        #       # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
        #
        #       # With php5-cgi alone:
                fastcgi_pass 127.0.0.1:9000;
        #       # With php5-fpm:
        #       fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                include fastcgi_params;
                fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script$
        }

but it gives white screen when i type in the ip address . my fevicon and the title shows

i have installed all the php required extension – mysql, gd, mcrypt, curl