If you get white screen it means some fatal error appeared. To find out what error you need to enable WP debug.
We are glad to hear that your site works again. If you face this issue in future enable WP debug and let us know about the error that you see then we’ll be able to help you. And provide also FTP access to the site because we can do nothing if you have the fatal error and we don’t have FTP access to the site.