Subdomain not working

Hi, thanks for looking,

I have done a successful subdomain on my linode before. I am following the same steps, but now it does not work, in firefox, I get Problem loading page "Firefox can't find the server at stats.mydomain.com".

Here is what I've done/got:

In the LM: A/AAAA record added with the correct IP and the right subdomain name "stats" (entering "stats.mydomain.com" does the same thing)

On the server, I've done the following

$ sudo nano /etc/apache2/sites-available/stats.mydomain.com

# Place any notes or comments you have here
    # It will make any customisation easier to understand in the weeks to come

    # domain: stats.mydomain.com
    # public: /var/www/vhosts/stats.mydomain.com/

    <virtualhost myip:80=""># Admin email, Server Name (domain name) and any aliases
      ServerAdmin admin@mydomain.com
      ServerName  stats.mydomain.com
      ServerAlias www.stats.mydomain.com

      # Index file and Document Root (where the public files are located)
      DocumentRoot /var/www/vhosts/stats.mydomain.com/

 <directory var="" www="" vhosts="" stats.mydomain.com="">Options Indexes FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all</directory> 

      # Custom log file locations
      LogLevel warn
      ErrorLog  /var/www/vhosts/stats.mydomain.com/log/error.log
      CustomLog /var/www/vhosts/stats.mydomain.com/log/access.log combined</virtualhost> 

Now I run the following

$ sudo mkdir -p /var/www/vhosts/stats.mydomain.com/log/ (this creates the parent directory)
$ sudo chown -R myUser /var/www/vhosts/stats.mydomain.com
$ sudo chgrp -R www-data /var/www/vhosts/stats.mydomain.com
$ echo "Hello World" >> /var/www/vhosts/stats.mydomain.com/index.html

Then I enable the site and reload apache

$ sudo a2ensite stats.mydomain.com
$ sudo /etc/init.d/apache2 reload

Upon loading it up in my browser, it doesn't work! Yes the parent domain works, and I've also got a working subdomain for another site on the same server, so I know it's possible.

What have I missed? Thanks for any help,

Bung