I'm having a similar problem. Can you fill in more details to see if it is the same?
Connection to box = component video
Connection to TV = component video
All I get is static, but sound is fine.
When I switch input to composite video and output to S-Video, the box works, but the edges are clipped. In other words, somewhere along the line the letterbox format is being generated but then clipped to fill a 4:3 window.
My provider is AT&T Uverse.
That's correct, if you are running an HDMI cable, please note that the HDMI connection is not a compatible one at this point, also, you can check the following link: