index.php not showing up?

[Liquid Fire]

ok it seems every time i install apache/php/mysql that is alway some god damn problem that comes up but this is one i have never had.  I have installed php 5.0.5 and apache 2.0.59 and mysql 5.0 and changed the config file for both correctly.  now when i load my localhost server, nothing shows up.  when i go to any index.php file nothing comes up( i have tried mine, phpmyadmin index.php, vbulletins index.php, etc...)  this seems to happen with most of my .php file but not all.  for example when i goto the install.php for vbulletin that show up fine.  I also create a index.php like this:

<?php
phpinfo();
?>

and that page shows up fine, why would most of my php page be showing up blank?