I just added speakers to my computer. They worked for a while, but, after I rebooted, the computer could not find them. They no longer are listed under Mixer or in Device Mangler. I ran mmsys.cpl, and they are not listed there, either. I unplugged the speakers, then rebooted, then plugged them in again. Nothing, How hard can this be? They're just speakers, oh, excuse me, "audio endpoints."