I am confused how this set up works. My monitor is plugged into my mini HDMI plug in on my computer. Now the USB and HDMI cord need to be plugged into my computer as well. Question is, I ordered an adapter for HDMI to mini HDMI so the headset can be plugged into the computer. But how can both the monitor and headset both be plugged in. I have an extra HDMI plug in but it doesn't work when I plug the headset in.