Do you regularly use your Mac's iSight camera for chatting and other purposes, and have you run into a "no connected camera" error in the application you're using? If so, then a few causes and fixes are available that might help you out.
OS X Daily has recently outlined one cause and fix for such problem. When you run a program that uses your Mac's webcam, OS X will launch a background process called VDCAssistant, which manages the connection and control of the camera. While this process should quit when the program stops using the camera, it may persist if an error occurs, and prevent future connections to the camera, either by the same program or by others.
The fix in this case is to force-quit the VDCAssistant process, so relevant programs can again launch it normally and establish connections to the webcam. To do this, you will need to perform the following steps:
- Quit the program using the camera.
- Open Terminal and run the following command (supply your password when prompted, but remember it will not show)