-Try to disable your plugins and activate them one by one to check what plugin causes the blank page.
-You can also replace the theme to it's default.
-Or Increase your memory limit in 'wp-config.php' file:
define('WP_MEMORY_LIMIT', '64M');
-If none of this works then you need to reinstall your wordpress files.
This link might help:
http://www.wpbeginner.com/wp-tutorials/how-to-fix-the-wordpress-white-screen-of-death/
