I have tried a whole bunch of different setups and diagnostic tools. They can't find anything wrong. I have tried the headphone on a laptop, and it works fine, and I have tried other headsets on my pc, and they all have the same problem.
The pc does not recognize that a headphone has been plugged in. It is not a USB headphone. I have tried to plug it in on the front panel that is seperate from the soundcard, and I have plugged it directly into the back of the soundcard itself. No difference. The sound continues to come from the speaker, and nothing in the headphones.