Currently I how the baby blue defaultwebsitepage.cgi , which often shows up for a while (up to 24-48 hrs) after changing domain names. That is because while cPanel updates your domain name and so does the nameservers, the server itself takes awhile to update its internal map that connects domain names with accounts (part of the reason is that the server has to be restarted and if the system did that everytime any one of the thousands of accounts on your server changes/adds a domain name, the sytem would grind to a halt).
Try clearing your browser cache before checking your site (possibly adding ?foo to the end to fool your ISP's caching system) again. If it has not resolved in 24-48 hrs post back.