Question / Help Black screen only with external webcam

Hi, I have a Toshiba i5, intel laptop and a Logitech c920 external webcam. When I add the internal webcam from my laptop, I can see the preview stream video no problem. However, when I change to the Logitech c920 external webcam, the screen is black and I can't figure it out how to fix it. Please help! I really appreciate it.
 
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