Video and audio are not working. The audio and video devices are missing or broken in the Preferences settings.
Image 1: Broken Audio Settings
Image 2: Broken Video Settings
VSee and other similar application listed the iSight camera, but the light didn't turn-on or no video when it tried to access it (and no error/warning messages from either app)
Force-Quit on VDCAssistant
- Quit all open apps that may try to use the FaceTime camera.
- Go to Application/Utilities/Activity Monitor and sort by process name
- Find VDCAssistant
- Double-Click on it to open the window about it
- Click on quit to stop the process
If the problem still persists, refer to this Apple discussion page for the full list of instructions to solve the problem.