Is My Domain Expired ? Content on the site is changed.
If content of your web site was changed and now on your site (on all pages) same content (some advertisment).
Then your domain is expired and was pointed to parking advertisment page of the domain registrar.
How to check is it really expired?
Go to any whois service like http://www.easywhois.com
enter your domain name and click button.
You will see whois output for your domain and "Expiration date".
If domain is really expired and domain was registered by us,
then you can renew it here:
Domain will be reactivated in few hours after the renewal.
If your Web Hosting Account is Suspended (you see such message when you go to your domain),
then please read this article.