More verbose error handling?

[eluser]kylemac[/eluser]
I'm getting the CI 404, which suppresses my apache/nginx error_logs - is there a way to trace the error from within CI? when I change the public/index.php to something like phpinfo() it works just fine, but when using the CI code, I get the 404...

I am migrating from mac osx to nginx (I'm up for apache too, just on nginx at the moment) - So I don't believe case sensitivity is the issue.