Help please - lost sound from DVD

This afternoon I put a DVD on for the children. No sound. I tried another DVD and again no sound.

I have the following:

Rotel - RDV 1080 (DVD)
Rotel - RSX 972 (receiver)
Loewe Aconda
Energy speakers
Sky+

No matter what I tried I could get no sound from the DVD through the speakers. As a matter of set up I do not use the internal Loewe speakers. I enabled the internal Loewe speakers and I could hear the sound. Yet disabling the internal Loewee speakers again and I could hear no sound.

I tried the Sky+ box, no problem. Sound from the speakers.

I have read and re-read the Rotel manuals and have checked all the connections and they seem to be secure.

The connectins from the DVD player, if they are any help, are:

Analog out - front left, front right, centre
Component video - Y, Cb, Cr

The Analag out and Component video leads are all part of a single connection by way of Scart to the Loewe scart input.

And then there is the Coaxial from the DVD to the receiver.

My logic suggests that there may be something wrong with the Coaxial connection. Is it a set up issue via the receiver or is it a matter of a loose connection related to the cable. Or am I missing something obvious.

Help will be appreciated.

Thanks