If you have a surround system, and want to hear surround, you need inputs and output, on your A/V receiver, for HDMI. If receiver has HDMI, that's the only cables you'll need (HDMI cable from each source, to receiver, and an HDMI cable out from receiver, to tv). If receiver don't have HDMI, you can run HDMI straight to tv for video, and digital coax or optical to receiver, for surround audio. If you are listening through the tv speakers, the HDMI is all you need, since it carries both audio and video.