I just bought the NuForce UDH-100. Plugged it in, bought a usb cable (didn't come with one) device software installed correctly. Went to the website and downloaded the driver and followed the pdf...it installed correctly...went to my playback devices and selected the nuforce spdif-out. Set it as default device, plugged in my headphones....and NOTHING. No sound..have no idea what to do next can someone steer me in the right direction?