The System Information window for your Mac will appear. Click on System Report from the pop-up window that appears. Click the Apple menu (in the top left corner of your screen) and then click About this Mac. While your Mac is in Safe Mode, check to make sure that your webcam is connected to your Mac.
Hold down the Shift key until the Apple logo appears.Test the device. Try starting your Mac into Safe Mode: Restart the computer while pressing the Shift key.Wait until the computer makes its second startup chime before releasing the keys. Turn the computer back on and hold down the Command, Option, P and R keys. Before you start it up, locate the following keys: Command, Option, P, and R. Make sure your Mac’s installed version of Mac OS X is completely up-to-date.Navigate to the USB section and check to see if the webcam is listed as a connected device. Click the Apple menu (in the top left corner of your screen) and then click About this Mac.Try connecting the webcam to another USB port on your Mac.
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