The blank page on the WordPress website can be mostly appears due to Plugin or activated Theme. You can try below resolutions:
If say due to Plugin: Try to access WordPress Admin page. If you are able to access it, login and deactivate all of the plugins. Now, reactivate each plugin at a time and see if website works.
If unable to access Admin page, log into Domain FTP. Rename Plugins folder to plugins_old. You can find Plugins folder under wp-content/plugins. Once done, try to access wp-admin page and follow the procedure as mentioned above.
If say due to Theme: Log into WordPress Admin page and activate default WordPress Twenty Twelve Theme.
If you cannot access Admin page, access your Domain FTP and navigate /wp-content/themes/ folder. Rename the active Theme folder.