Hi, this has happened to me after installing a new plugin. Sometimes after you log into your site, it will turn white and never do anything.
My solution to this is to disable all the plugins and then reactivate the ones that have never caused problems.
Here is a tutorial and video that can walk you through it: http://whydomy.com/2012/11/30/how-to-disable-all-wordpress-plugins-through-the-database-fix-the-admin-white-screen-error/
It will disable all of the plugins by going into the database.
I had this problem before I backed up my site, and I almost had a heart attack.
Hope that link can help you.
Hi granaussie.
Could it be a newly installed plugin that is causing this problem?
If you think so, follow these instructions: http://whydomy.com/2012/11/30/how-to-disable-all-wordpress-plugins-through-the-database-fix-the-admin-white-screen-error/
That will disable all plugins, then you may reactivate the ones that work fine.
Hope this can help you.