As a friend just found with some issues Xbox 360 Live account activation, a reminder that Xbox Customer Support can be reached on-line at http://www.xbox.com/en-US/support/migrationcentral.htm.

And if you run into a hardware problem, call 1-800-4myXbox or go to http://www.xbox.com. If the problems can't be immediately resolved, you'll get detais on how to ship the console overnight to a repair center, and Microsoft will ship it back once it's fixed or ship a replacement.