Walking through Joomla forum there's some guys got blank home pages on the fronted or backed admin page.many people ask why they got these errors, and how to solve this.  well, there could be many other reasons,but, to give you something to try, maybe you could look into these points.
joomla blank pages Occurred:

• after login (admin or frontend)
• after installation,fresh install joomla or some extensions
• after transfer, migration,or upgrade

Reasons cause blank pages and the solutions: