Thank you for reaching out to us via our online Answers Forum. I can understand the need to replace a unit that will not power on. I would be glad to assist you. What I can suggest is try unplugging and plugging back in the unit and testing it in other outlets. If all that fails you can contact us to further troubleshoot the issue at hand. Be sure to note the manufacturer of the Slingbox AC power supply (the wall adapter) when you contact our technical support line. The power adapter will either be a "Ktec" or "V-INFINITY" power adapter. Having that information in advance will help us resolve the issue better.
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Hopefully this helps out!
The Sling Media Moderation Team