So my pops is watching TV with his Series 3 when he sees something that looks like one of those weekly warnings or emergency signals. Not sure if that's important or not but soon thereafter he loses a few HD channels. He can tune to the station but all it says is "channel not available". No signal. He gets other HD channels but not CNN and a couple other stations around the area. He confirmed that he is able to tune to the same channel on another TV in the house (HD as well). So this doesn't appear to be the matter of a channel kind up change. Charter, the cable provider, didn't have any immediate solutions. They are sending someone out tomorrow. Any thoughts on this? I was thinking weak signal or a bad card. Thanks everyone.