I just installed a DVD burner replacing a CD burner. I have no sound either. I did plug the audio cable in, but perhaps I did it wrong.

I have a Windows XP Gateway w/ N1996 motherboard.
There are three jacks, one green, one yellow, one black. I tried all thee. It is a I/O Magic 16X DVD+-RW/+-R. Did you find out what to do? Any suggestions? Thanks.