Integrated Webcam is not working on Dell Inspiron 5558

I have Dell Inspiron 5558, running on Windows 10 64 bit, version 1703 with 8GB RAM

The integrated webcam simply would not work nor the in-built mic.

When I raised the issue with Dell, they have tried to troubleshoot. Dell diagnostics F12 could not detect any issue.

They have changed the webcam and cable and it was still not working.

They changed the Motherboard and again no luck.

They asked me to reset the system to factory and I did. Now, the Webcam is not there in the Device manager.

In fact, the Imaging Device is not listed there. I have checked under hidden devices and still it was not there. Now they are asking me to take it to the service center for a checkup.

They can't figure out. I am sort of feel that it is a problem related to OS, but I am not sure.

Can one anyone tell me exactly what is the issue? All my drivers are upto date. Believe me, I have done every troubleshoot under the sun!

Your help will be most appreciated.