I have this coax tester that I used to test the jack. I put one of the colored remotes on the jack, then I checked every cable going down into my basement, and none of them lit up the tester. So the cable must either be bad, or the cable from the bedroom goes somewhere else that I don't know about (this jack has been dead since I bought the house).
Anyway, I called Verizon and they are going to send someone out tomorrow morning so hopefully they will figure out what's going on.