I recently worked on a client’s computer that was giving them the error “no active mixer devices available” whenever they clicked on the volume icon in their task bar. This problem came up out of nowhere and it was almost of if the computer never had sound before! In the Sound and Audio Devices applet in Control Panel, everything was grayed out and there was a message saying “No audio device” under the Volume tab. Upon checking under the Hardware section via the System Properties, we found...