Webcam not working, shows black screen

I have a Dell Inspiron 1420 Laptop with a built in webcam.
When I open the webcam center and try and capture video, the blue light by the camera goes on, the record button is activated, but all I see is a black box in the display area.

I also tried this with skype and I get the same thing.

Can someone please help me?
Thank you.
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Have you tried lowering your screen resolution.  For testing purposes, try 800x600.  I had the same exact problem with a LCD projector, and lowering the screen resolution worked.  This may not be the solution, but it would be a start to rule it out.
Razzmataz73Author Commented:
I just put my computer display settings to 600 x 800 and the Dell webcam center video to 640 x 480.  But it still shows a block box in the display area.
Razzmataz73Author Commented:
Went with a new external webcam, since we couldn't get the internal one to work.

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