Thanks for posting to the forums!
If you have a black screen while connected to your Slingbox PRO-HD, you might just need to press the power button on your virtual remote to "wake" your DirecTV DVR.
If pressing the power button does not restore audio and video on your SlingPlayer for iPad application, the Slingbox IR signal might be having trouble reaching your DVR receiver. I would recommend checking the placement of the IR sensors. This article will guide you through the proper troubleshooting steps for your Slingbox IR sensors:
If you find that the Slingbox IR emitters are not the issue, it's also possible that you have an incorrect virtual remote configured. This article will guide your through the remote configuration process:
Hope this helps!
Sling Media Moderation Team