Hu: When you connect Digital Optical Cables from DVD players, Sat. Receivers, etc to the JVC, you must do some setup from the front panel first. You have to select the Digital Input (Optical, Coaxial or Analog; you have to go into setup and tell it CD, DVD player Sat Receiver, etc. I suggest that if you are not familiar with this, and you can't follow it in the manual, call JVC on their toll free number. They will talk you thru it. They are quite helpful with it. Good Luck.