But I have come across similar laptop model where the motherboard didn't have the webcam port plug in. So first you should see if you can take your case apart and look for a internal plug for your webcam if your going that route and doing all this dis-assembly will void any warranty you have on it.
But you should check will Dell site using your Service Tag to see what options they had for webcam or if your motherboard came with a webcam pluging otherwise if it doesn't then your left with external webcam.
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