After installing Ruby on Rails, I am getting "404 not found ... dispatch.fcgi" on everything in my webserver!
You probably had meant to add a Ruby on Rails virtual host, instead of converting your entire server to Ruby on Rails.
I'd recommend creating a new virtual host, but that's beside the point. What's causing the 404 messages was the line you added:
RewriteRule ^(.*)$ /dispatch.fcgi?$1 [QSA,L]
Which you added either in httpd.conf or in .htaccess for your site/server.
Remove that line, and place it to only take effect upon the virtual host you want to run rails on.
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