The headset port in the front of my computer is acting up, it did this after I installed a network card, but I'm pretty sure that has nothing to do with it. But anyways, When i plug my headset cord in all the way in the port, I can only hear out of the right earphone. I plug it in partially, so the cord is sticking out a bit and I can hear from both earphones but the 3D sound is off. I know it isn't the headphones because I've tried the other port in the back. I would use that port but my headset has a mic as well and the only mic port is in the front.