Ryan Pickston

Hi my Sony dvp fx720 DVD player won't give any sound through the headphones & there's a red light in the audio optical out hole which I've never noticed before. I've tried everything. Everything else works fine & the headfones worked up to the other day , now whenever I plug the headfones in & I've tried various sets , I lose sound. Could my kids have turned something on ? I have tried menu & display & options but still nothing. Can u help ? Thanks. Ryan. 07947656772. The crazy thing is I've 2 of these & I've the same problem with both , it seemed to happen overnite, just wondering if my kids could of messed with them, & if so what have they done to turn this red light on & for them both to loose sound when the headfones are plugged into a or b