Do it yourself : A beginner's guide to start debugging Joom
Blank page, Strict Standards and others - how to fix those errors - JoomShaper
Article Shows as white screen but plugins load - Joomla Stack Exchange
Oops! Joomla blank page after migration? - Ways to Fix
Upgrading from Joomla 3.1 to 3.2 - Problems & Workarounds - CloudAccess.net Blog
Joomla! Issue Tracker | Joomla! CMS #36833 - [4.1] Update from 3.10 to 4.1 fails with blank page but can be resumed by page reload when opcache is used