OK, HDMI is not in play. Do you see the light?
I can look at the end of my optic cable and when it's in the DVD player the other end can be seen (I don't look at it but point it at some paper.) So let's see if that step works.
PS. Skip to "No Light" at http://www.doityourself.com/stry/5-common-optical-audio-cable-problems