HI-FI

Hi

After googling Ive discovered what I think might be the cause of my problem
and would appreciate if someone who knows (likely someone here?) could
confirm or deny for me.

Im connecting a MCE PC with a coax SPDIF output to my AV amp and I am only
getting L + R front speaker output. The amp doesnt light up the rear or
centre speaker on its display but the PC is definately trying to output all
channels. Could it be the cable? Im using and old video lead that happens
to have the right plugs on it.

Do I need a specific cable to gett full 5.1 sound?

Many thanks