[eluser]TheFuzzy0ne[/eluser]
Try removing the closing ?> tags, they aren't needed, and chances are, one has a space after it. Also check the opening PHP tags to ensure there are no spaces before them.
Also ensure that compression is disabled in your config.php
Also, disable your database (if you load one), and see if that helps. Misconfigured databases are a known cause for no output being sent.