[ubuntu] Localhost can read phpinfo() but not my index.php ?

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http://ubuntuforums.org – I'm new to Ubuntu and linux (began summer 2010). Installed apache2 and php5, got the message "It works!" and phpinfo() displays the info page from withing the my folder. But when i put my index.php and rest of the files in www/mysite/ I only get a blank page displaying nothing, as if my php scripts wont parse. If I create a plain html "hello world" doc it displays that.. I've used this guide before http://www.howtoforge.com/ubuntu_lamp_for_newbies and got it to work last time some months ago, but this time around after clean ubuntu reinstall it's showing nothing, remember I (HowTos)