Wordpress be default does not have correct syntax for all platforms.
in index.php under root and /wp-admin folders you will need to remove the "./", their should be one in each file. This will fix the blank white screen in most cases unless you have database connections issues as well.
Some versions of MySQL and Php do not play nice together as the newest versions of Php do not support old-password, you may need to verify that your mysql password is being stores in the new more secure method.