The easiest way to check whether your computer is able to connect to the camera is to launch System Information. This can be opened straight from Spotlight or from the Utilities directory in your Applications folder.
Alternatively, go to the Apple Menu and select About This Mac, then click the button for More Info. You can launch System Report from the next window which appears.
On earlier Macs, the System Information screen was called System Profiler instead. Aside from the difference in its name, it can be accessed in the same ways described above.
Upon opening the System Information tool, you should see a screen which looks like this one:
Click the USB category on the left hand side first, then expand the USB devices on the right. You should see the camera in your list as shown. It might be called HUE or simply identified as a basic USB Camera; either is fine.
If the camera is missing, please check the connection between your computer and your HUE camera carefully. The camera should be firmly pushed into its base. Go to File and then Refresh Information (Command + R) to refresh the list of devices when you want to check whether the problem is solved.
If the camera is showing up correctly in the System Information screen, it should be available in all of your other camera applications such as Skype, FaceTime and Photo Booth. Please check that it’s not ‘in use’ in another application then Quit and reopen the software you want to use.