Hello,
Before emailing support that your site is down, please read the following:
The IP changes to the server are still propagating through our nameservers and anticipated to have completed around 8pm PST. The following steps will not need to be used until after that time.
If you host your DNS elsewhere (the nameservers are not pointed to ours), you will need to change the A record for your domain to 216.227.220.4 before continuing
IP Address changes for a server will also mean the IP address for any accounts not using a dedicated IP will have changed as well. It is possible that your computer has cached the IP information for your domain and you will need to clear this by running the following command from the Start -> Run menu on your system:
IPCONFIG /FLUSHDNS
If this does not resolve the issue, then please provide a trace route to your domain with a support ticket