I got two errors!

[eluser]Kepler[/eluser]
You may have whitespace before the <?php in /home/user/public_html/system/application/config/config.php on the first line.

Any new lines, tabs, or spaces before the <?php or after the ?> is output to the browser. Any header() function call after that will fail since no headers can be sent after content.

I would suggest 644 (rw-r--r--) for php files except the ones that need to be updated by code. Config files sometimes get updated by code. For those use 666 (rw-rw-rw-).