If you are using an HDMI video/audio cable, regardless of which cable converter box you have, you will need to change your TV input to whichever port your HDMI cable is plugged into on your TV. For example: HDMI 1, or HDMI 2. The same is true for other Audio/Video cables such as component or composite cables. Most TV’s will have designated input labels for these connections in the “Inputs”, or “Source” menu. If you are using a screw-on coax connection to your TV from a cable converter box, you will need to keep your TV on channel 3 or 4. You may have to try both channels until the picture comes in clear.