Are you sure you have done all of this?
http://wordpress.org/support/topic/remove-ability-to-comment?replies=10
Dashboard > Settings > Discussion Settings is where you disallow comments, then go the the editor for all previous posts and pages and uncheck comments.
then go the the editor for all previous posts and pages and uncheck comments.
When I go here I do not find an area to uncheck
Look at “Quick Edit” rather than “Edit”, and please forgive me for not first taking a look myself!
Hey, it worked for me! Thanks!
