Greetings, This weekend, after starting to use my docking station for the Surface Pro 3, I had sound from the speakers I had plugged in to the headphone jack on the docking station. I also had an entry for that output in the "playback devices" entry for the audio. However, now that entry has suddenly disappeared, and the audio just goes straight to the internal Surface speakers, instead of my connected speakers. And no matter what I do I can't the playback device for the docking station back. I tried system restore to a date where it worked, removing all audio devices and restarting, and to download the audio drivers for the docking station (version 18.104.22.168) and installing them manually (right click on the *.inf file) - still no luck. It's like Windows is refusing to see that there is something connected to the docking headphone jack - no matter what kind of speakers I try to put in there. Does anyone have any good suggestions, apart from perhaps restoring to factory settings?