Blank Pages after Moving Index.php

I successfully had a wordpress up and running in its own directory ( http://myexamplesite.com/wordpress/index.php ). However, I wanted to move the index.php file to the root so the blog would be the first thing people saw when they came to the root ( or in this example, http://myexamplesite.com ).

I followed the directions as listed in the codex ( http://codex.wordpress.org/Giving_WordPress_Its_Own_Directory ). The only difference is that my site does not have an .htaccess file. I updated the src attribute in the index.php, moved it up into the root, and tried to browse to the URL. I got it to work once. Now, however all I get is a blank page – looking at the source there isn’t a single thing being sent back. I can, however, still go to http://myexmaplesite.com/wordpress/wp-admin and log in successfully.

Any ideas what I did wrong? Why is my wordpress installation now showing blank pages?