hi i just recabled my 7.40 mk ii tv for my new cabinet, everything is cabled up right, but i get no sound at all when on tv mode. when i switch to dvd playing i get sound from all front, rear, woofer speakers except the centre speaker....any ideas?

when i got to tv -> menu -> options -> sound -> sound levels, nothing plays on any of the speaker channels....was working fine before I moved the tv and re-cabled....