you may want to contact sling support per their announcement on the forums page
Announcement: No power to your Slingbox? Give us a call!
We hope everything's great with your Slingbox, and you're enjoying watching your TV anywhere.
But in the off-chance that you're having a problem (for example, your Slingbox is not powering up, or the power light will not come on, or is blinking randomly) - just call us! We want to help you.
US and Canada customers, call 1.877.GO.SLING. For other countries, you can find the correct contact info here.
Be sure to note the manufacturer of the Slingbox AC power supply (the wall adapter) when you contact our support agents - it will say either "Ktec" or "V-INFINITY". Having that information in advance will help us serve you better.
The Sling Support Team