Blank Home Page on Amazon EC2 - codeigniter

Question

I feel like I have no idea what I'm doing.
My CodeIngiter application is working fine in WAMP using this URL: http://localhost/myapp.
However, when I moved it to my AWS EC2 micro instance Amazon Linux AMI /var/www/html/myapp and tried to access my application using this URL, http://xxx-xxx-xxx-xxx-xxx.compute-1.amazonaws.com/myapp, all I get is a blank white page.
Here is everything I tried:
1. Disabled "Index of" display
cd /etc/httpd/conf/
sudo nano httpd.conf
Options -Indexes FollowSymLinks
2. Turned on Error reporting in php.ini
error_reporting = E_ALL | E_STRICT
display_errors = On
3. Development Environment
In the index.php (root of my applicaiton),
define('ENVIRONMENT', 'development');
4. Restarted Apache
cd /etc/init.d
sudo httpd -k restart
5. DocumentRoot
DocumentRoot "/var/www/html/"
Also tried:
DocumentRoot "/var/www/html"
DocumentRoot "/var/www/html/myapp"
6. echo test from index.php
I printed a test message from both my index.php
(root of my app), as well as my controller. Both
worked. I don't understand why my view is not being
displayed.
<?php echo "test"; ...
//This worked.
7. Replaced www/html/myapp with www/html/
I moved the contents of my application outside of "myapp"
folder into www/html directory.
Also, DocumentRoot "/var/www/html/".
Also, my .htaccess file (in root of myapp)
is "RewriteBase /" (see point 8 below).
Also, I removed .htaccess from /var/www/html/
but same blank page.
8. .htaccess
The following .htaccess file is located in the root
of my CodeIgniter application. I also tried changing
RewriteBase /myapp to RewriteBase / but I'm still
getting this blank page with no errors.
RewriteEngine On
# Put your installation directory here:
# If your URL is www.example.com/, use /
# If your URL is www.example.com/site_folder/, use /site_folder/
RewriteBase /myapp
# Do not enable rewriting for files or directories that exist
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# For reuests that are not actual files or directories,
# Rewrite to index.php/URL
RewriteRule ^(.*)$ index.php/$1 [PT,L]
I do not know what to try again.