viore akai 46" has no sound?

viore 46" tv tryin to hook up hd thru dvi cord from tv to x box visual is great but can't get the sound to work...bought a new cord that would work but the ports at the back of tv are not the usual...dvi pc and rs-232 not sure what that is but the cords only fit where they fit so i'm stumped i'm sure it's system setting or somethin any help would be great