DVD player and DVR issues - Time Warner TV

This question is about "DVD player and DVR issues", with Time Warner Cable TV and apps. Ever since I switched to a DVR from a regular cable box, my DVD player no longer connects to the TV. I have an old TV and use an RF Modulator. I don't understand why the DVR became the problem, since all the connections were basically the same. Any ideas about what to try? I had given up but want to try again. Thanks.

This topic covered DVD player and DVR issues, and TWC cable tv service.