Laura,
I don't know how yours is connected, but many bay TVs are only repeaters. That is, they just show what is on another TV. Turn it on, and then try your bedroom TV and see if you don't have the same program. Then try the front TV if it isn't working. If still not working, do you have 3 digital receivers? If not, you will have to purchase a 3rd receiver from DirecTV and pay the cost of an extra receiver on your monthly bill.
Roy