Your laptop looks like it has Optical TosLink audio out so you can get a Digital Optical TosLink Cable from CableTrain.com for 4 bucks, and connect that from your laptop to the Onkyo receiver. You wont get audio from your TV, but your reciever will provide the audio you need from your laptop.
Link to TosLink Cable:http://www.cabletrain.com/cables/audio-c…
Tags: Cf48, Connect, Dp42647, HDTV, Home, Htr550, Onkyo, Panasonic, Sanyo, Theater