I understand that your having an issue with the power on your Slingbox. I would recommend that you contact Sling Media regarding this issue.
The link above explains how to get in contact with our Support staff anywhere in the world. In the US, simply call 877-GoSling(877-467-5464), our hours of operation are 10am to 10pm est 7 days a week.
Hope this helps.
Sling Moderation Team
Call them ASAP. If you are under warranty they will send you a new one with a box to return the broken one.
They will ask you to plug it in and hold down the reset button for 20 seconds, and if that doesn't work they will replace it.
I was on hold for 40 minutes on a Saturday. They say weekdays are better. Good luck!