geoyogi3 on "Help, my site is down and it's not the host!"

my website is http://www.amyreedyoga.com

I contacted GoDaddy - they say everything is fine on their end. Here's the error message I keep getting:

Not Found

The requested URL / was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

help!