If you bought the xbox 360 S with kinect bundle, the kinect should not have a plug, but a strange lead that plugs in to the Xbox. Do you have the Xbox 360 S (with the touch power button) or the old one? If you have the old one, you will need the usb kinect. I don't think you should have this problem of getting the wrong kinect port, so try contacting the seller. If you got it from somewhere like ebay, I'm afraid I can't help you