Camera not working - 0xa00f4244

I have tired everything suggested on both dell and microsoft sites: 

https://www.dell.com/support/kbdoc/en-uk/000125158/resolving-the-we-can-t-find-your-camera-0xa00f4244-nocamerasareattached-error

Still getting this error...

As well as this the sensors for windows hello do not work and have not been for a while (I was still able to use the camera, they are unrelated)

Any help would be much appreciated