Do all home theatres have an optical plug?

Ok... I dont know a whole lot about this, but ive done a bit of research, and heres what I know... I have a sony home theatre that i recently bought, and im trying to get the 360 to work on it. Ive heard you need an "optical cable" which i bought... i plug it in on my 360, then i have to plug it in on a "receiver" which i dont know what a receiver is... is a receiver the same thing as your home theatre?

And do all home theatres have an optical imput? I cant find one... so im wondering if I bought the wrong one.

Tell us what you got. what Make/model receiver/HTIB do yo have?

I actually cant even get that to work.... i plug the red, blue, and green into the tv, and the yellow, white, and red into the home theatre... i get no sound at all. What do I do to fix it?instantdeath999

Okay, so you are using component (red green and blue) on your tv, which is right. Then you want the audio to your theater so connecting the red and white cables to it is correct (but you don't need to use the yellow sd cable anymore, leave it hanging out).

I have to ask, did you plug it into an input on the theater, or an output? And then set the theater to that input?

make sure the "receiver" is set to the proper input. It should be called something like aux or TV