Couple more things to consider:
php app/console cache:clear --env=prod --no-debug
php app/console assets:install web_directory
php app/console assetic:dump web_directory
You might also run into permission issues with the cache directory. I would actually first make sure everything works in development mode on the server before switching to production mode. And if all you get is blank screens in production mode then set debug to true. And of course know how to check your error logs.