...
Step One
Check to see if your server is online using our in-house monitor, Netstatus.
Get a second opinion by checking with a third party monitor like this one. Check a few geographic locations of choice, then type your domain in the box, and see if you get "OK" status. if you get "OK" from 2 or more locations, your site is generally running fine in most cases.
Step Two
Check the maintenance forum for announcements
If nothing is listed here this issue is yet to be escalated to a long-term outage status, or there are no existing long-term outages.
...