wordpress pages showing as blank

Hi guys. I have successfully installed wordpress but for some reason I am unable to view any pages I create (or the default page) – it just shows as blank with no source code to view. I have tried installing a different theme but this still doesn’t work. I have also checked to make sure the .htaccess file is there and even tried changing the setting to the below as my wordpress installation is in a sub directory called ‘blog’. Still nothing! Can anyone help? It would be massively appreciated!

Sam

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]
</IfModule>

# END WordPress