I have 3 plug in in the back of my computer one speaker i can unplug and hook up my head phone and it work fine. But when i hook the head phone to the plug in the front of my computer and i listen to a song like a rap music i might hear the 1st rapper but the 2nd and 3rd rapper i dont hear but i can hear the beat and everthing the 1st rapper is raping. And some video i hear alot static. Also i just had new motherboard put in could that be it.