Hey guys, got myself a home cinema / dvd / hi-fi all in one system today to go with my lcd tv and hooked it up pretty quickly. I've connected all the cables as istructed in the manual but I can't get the sound from the t.v to play through the hi-fi speakers. I can put a DVD into the hi-fi and it will play perfectly with sound coming out of the speakers, do I need to buy some extra cables? I'm pretty clueless. Any advice would be greatly appreciated.