I got my cable hooked up in a new apartment a little over a week ago. When I went to watch TV yesterday, my cable doesn't seem to be working. I can view the guide and select a program to watch, but when it goes to the channel, there is no picture or sound. I have rebooted the cable box and unplugged it, but am still having the same problem. Before the problem, nothing had been unplugged or any cords changed, so I know that cant be the problem. Anyone have any idea what the problem might be?