My web host had a major hardware outage. They said they restored everything but nothing has worked right since. I have checked the Sugarcrm.log file and there are no errors logged. I tried running the Quick Repair and when I do, I only get the blank page.
A blank page almost always indicates a PHP error. Maybe they restored with an older or new version of PHP. Turn error reporting on in your php.ini or .htaccess or user.ini files and that should help you diagnose the issue.
It might be a MySQL error as well. I’m not sure what message, if any, when there is a DB issue.