Problem with selecting channel in Timer On

Hi,

I have been trying to set the Timer On function of my TV, but the place were I can select the channel I want to come on is grayed out. I am currently using Dish TV has my satellite provider. The TV does come on at the time it is set to come on, but all I get is a screen saver. I have it set to HDMI 2. I can't use the TV function alone because I do not get any signal in my house. Please let me know what I can do. I bought the TV less than a month ago at Best Buy. It is a