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.

I'm not 100% on this but I think this is a problem with the port itself. On the headset jack that you plug into the PC there are these rings normally colored black or some color anyways this normally happens when the connection on the inside of the port are no longer making good contact with the headset jack. Short of replacing the port I'm not sure of anyway to fix this. You may what to take it to a local PC shop and have them take a look. Unless you know how to replace the port yourself.

I hope this helps

__________________
If builders built buildings the way programmers wrote programs, then the first woodpecker that came along would destroy civilization.