Hello, I have no sound on the left speaker of my headphone when it is plugged at the front panel. when plugged rear it works. when plugged headphones into the desk speakers logitech 2+1 it works. my desk speakers logitech 2+1 are plugged at the rear panel it works fine. when I plug the headphones at the front I get sound only from the right speaker of the headphone. System newly setup with all drivers. sys: win 7 pro, asus z 77 a, i5 3570, gtx 760. I have changed front panel audio connector settings from hd audio to AC97 and vice versa. front audio connector inside case checked if properly plugged. I would appreciate it very much if anyone have an advice, as I do long gaming sessions after everyone is asleep and I cant hear from desk speakers at night, not to make all neighbours and family upset.