Like RCbridge said, try another source. DVD, Blu-Ray, Roku, etc. Try it on the same input you have your Dish receiver on. It could be a problem with the TV screen, the TV input, the cable you are using to hook up the Dish receiver, or the Dish receiver itself. Until you try some troubleshooting and let us know what you have tried and what works/doesn't work, it is pretty hard for us to help you.