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I'm currently experiencing the same issue. I was able to get my microphone to work, but my camera isn't even detected by the system for some reason. 

Any help would be appreciated.

It seems you did everything.
Please update your driver from here,

https://www.dell.com/support/home/us/en/19/Products/?app=drivers

Can you specify exactly which driver to select and install?

I had previously installed the Realtek IR Camera Driver on my system and it didn't fix the issue. Do you have a different solution?

Was your camera ever fixed? I have the same model laptop and have tried everything without success. 

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I have the same problem with my E7470. The right usb is dead too. I get overcurrent message. I think both camera and usb 3.0 is connected in some way. And the detection of the overcurrent causes the system to shut them down.

I have one with same issue now, and it's not showing in Device manager. Would like some options to troubleshoot. 

If anyone still having this problem, Try changing the display cable, it has the camera module attached to it and the microphone too, i have the same problem, mic working but camera not detected in device manager.. I'm going to change the display cable