Common Codebase only multisite

I definately need help with an issue.

I had a couple of sites all setup as individual drupal domains on my server.

To take advantage of a single code base for them all, I decided to use a multisite.

So, I setup another Drupal 6 site called D6Multi, I moved the settings.php for one of my existing sites, lets call it sample.com, into
D6Multi/sites/sample. I also moved all it's themes and modules there resulting in the following file structure :

D6Multi/sites/sample/settings.php
D6Multi/sites/sample/modules
D6Multi/sites/sample/themes

I have the following virtualhost definition for sample.com:

ServerAdmin admin@mail.com
ServerName sample.com
ServerAlias www.sample.com

    <IfModule mod_rewrite.c>
       RewriteEngine On
       RewriteCond %{HTTP_HOST} !^www\.sample\.com$ [NC]
       RewriteCond %{HTTP_HOST} !^$
       RewriteRule /(.*) http://www\.sample\.com/$1 [L,R=301]
    </IfModule>

    DocumentRoot /server/www/D6Multi
    ErrorLog /server/www/D6Multi/log/error.log
    CustomLog /server/www/D6Multi/log/access.log combined

    # Possible values include: debug, info, notice, warn, error, crit,
    # alert, emerg.
    LogLevel warn

Now, when I visit sample.com I just get a blank screen. Though the database is intact and the theme and even the modules are all there. If I call up the install script, it begins the drupal install process

So, I concluded that blank screen is not actually sample.com but actually D6Multi.

If this makes scense to anyone, I could use your help.

Thanks