Thanks for using our forums. Sorry to hear you are having issues with your PRO-HD. If the power supply appears to be working correctly, it is more than likely the Slingbox itself that is at fault. There are a few different options at this point to replace the PRO-HD. You can do an out of warranty exchange, where we would send you a replacement PRO-HD for a fee of $149.99 or you can take advantage of our upgrade program, which would be $30 off the price of an M1 or SlingTV. The M1 would be $119.99 and the SlingTV would be $269.99 with upgrade. Below please find the link for the upgrade program.
Hope this helps,
The Sling Moderation Team