A: Thank you for coming so quickly. B: What seems to be the problem? A: All the channels suddenly stopped working. B: Did you make sure all the cables are plugged in? A: Yes, I checked and double checked them. B: There may be some kind of signal interference. A: Is there any way you can test that? B: Of course! Give me a moment, please. A: Do you know what the problem is? B: Not quite yet. So you can't change the channels? A: No, not at all. B: Well, you'll be able to once you change the remote batteries.
