Hmm.. Did you just go through a storm where your antenna might have moved? Is the DVR the only receiver in the house? If not, do the other receivers work? You might also try a reset. To do this find a little door on the front of the receiver. Push it and it will open towards you. Find a little red button in there. Push and hold it for a few seconds till the power seems to go off. Let go and it will take almost 5 minutes to do it's thing. Good luck.