I have a new Astro A50 which was working perfectly until I decided to move the USB cable. Afterwards I got silence, then broken sounds if I selected the digital output. I found a video on Youtube that showed me how to get clear sound on that port, but that means that I've only got stereo, not the virtualised surround sound I had before. Selecting Astro A50 as the output device produces silence. How do I fix it?