Sound has gone out and bar appears on picture

On my Contour box, it seems that no matter what channel I select, I see a dark vertical bar on the left side of the screen and there's no sound at all. I've tried rebooting it from within the menu on the box and also did the online reset. Neither solved the problem. How do I get this problem fixed?

I know it's not a problem with my TV because I can view a channel on the antenna without any problems.