Sorry that you are having a black screen and no audio issue when streaming. There could be several reason as to why you have encountered this issue. So, that we can narrow down the issue you are having. Please answer the following questions:
What Slingbox do you have?
What device are you using to stream?
What type of connection are you using, ex: composite, component, or HDMI
Please review the links below for further reference:
- Black screen instead of the program guide when viewing remotely
- I get no audio or video
- What is HDCP and why should you be concerned about it when using an HDMI video source? And what is SOC?
- Confused by all of the ports and cables on the back of your TV or Slingbox? Here's an illustrated glossary.
Sling Media Support Team!