Sorry to hear to that you've run into some issues streaming from your Slingbox. You may be getting some form of copyright protection called HDCP. It may also be that the resolution your cable box is set to is not supported, which can be easily fixed by switching to a supported resolution. Check out the links below for some tips on how to resolve this problem. Please let me know if you have any other questions!
- Slingbox.com - Watch on Slingbox.com plays audio but no video
- Slingbox.com - Using an HDMI video source with the Slingbox 500
- Slingbox.com - Video resolutions supported by Slingbox M1/M2, Slingbox 350, & Slingbox 500
Sling Media Moderation Team