DR500 Upgrade & No Sound!

I wonder if the forum can help me. It's quite possible I've made a schoolboy error.

Today I collected my 500 after it has been upgraded to DR spec. Naim turned it around in two weeks and I even got a new cardboard box (my one was getting tatty). So all was set fair for some audio heaven.

Rebuilt the brawn stack, connected it all up and put on the first cd and no sound to be heard. Turned it all on and off a few times. Rechecked cables. Mute was off on the pre-amp. The green light around the back was lighting up against the CD input. Tried the radio with the same result.

If you turn it up above 12 O'clock you can faintly hear the sound of the cd or radio. So a signal of sorts is getting into the 500.

Any ideas? So disappointing to get no sound. It was originally booked in for its DR treatment back in March. Was quite looking forward to it. Anyway, I've powered it down for the rest of today. I'll let the dealer know tomorrow.

Kind regards,

Ghetto yout'.