Thanks for using our Answers Forum. I understand that you do not have any power going to your Slingbox. You should contact Slingmedia so that we can take care of this for you. This link, Contact Sling Media Support provides the information that you need to get in touch with us. If you are based in the US, the number you would call is, 877-GoSling (877-467-5464).
Hope this helps.
Sling Moderation Team