Good afternoon! My name is Becki, with DISH. I hope that you have gotten this resolved, but if not, here are some steps to do so!
If you are at TV1, where the receiver box is located, the tv needs to be on channel 3 or 4. (The correct location for these on the back of the recever will have a TV 3/4 above it.)
If you are using an HDMI cable, then the TV will need to be on an HDMI input
If you are using Component cables, your TV will need to be on a component input. (Usually Comp 1 or 2)
If you are using RCA cables, then the TV will need to be on a VIDEO input (Usually Video 1 or 2) (The correct location for these on the back of the receiver will have a green TV symbol with a 1 in it.)
Please let me know if you need any further assistance!!
DISH Network Customer Service