Sources for fixing a drupal white screen of death - wsod Very extensive list:
http://drupal.org/node/158043
http://drupal.org/node/482956 Common causes:
- php memory => increase size
- php version => change php version (servers often upgrade without informing)
- files directory in sites missing or permissions wrong => check it, >> permissions
- color module => clear cache, disable, clear cache, re-enable, clear cache
- duplicate modules, themes => check, delete
- there are a few more...
These have happened to me numerous times. If theme related: http://louis-sawtell.com/content/reset-drupals-theme-using-mysql-database
This was very difficult to pinpoint and happened to me once.
Update 21 August 2012
There are a lot of hits on this WSOD issue at the moment, showing that there may be a specific problem right now. Possibly it is a service provider (php update) or a module (new version) affecting a number of sites; there is no core update at the moment. Of course, it could be something else... If you have solved it, please leave a comment, because everyone else looking here right now is probably having the exact same problem.
Update 30 August 2016
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