So I bought a computer, a hp pro 3400 series MT and I put an old SSD that I had with my previous files on. Everything worked fine but I'm having the same problem I had before: the microphone. The old computer was a laptop and was only able to use the built in mic but none from any headphones. The same problem is happening on this computer as well. I've tried using multiple ports, headphones and have re-installed the drivers. Nothing has seemed to work. I have done the microphone test and the computer recognizes the mic, it just doesn't do anything. I read up on the 4 pin plugs and 3 pin plugs and I have a good feeling that I can't find a four pin connector on my computer which is why the microphone is not working. But I still can't fix this. I need some help here.