Thank-you for contacting Slingbox Forum. I am sorry you are having a power supply issue.
If you are within a year from the date of purchase please call Sling Media Support at 1-877-GO-SLING or 877-467-5464. We will be able to assist you with that power issue if you are within that year of warranty.
Hope to hear from you soon.
Have a great day!
Sling Moderation Team