I'll preface this with, "This is not a crisis." I virtually never use the webcam and haven't done so in months, hence the reason I'm only seeing this now.
I installed Skype and when the camera test part came about I got the error message that no webcam was detected and to make sure that if it is an integrated webcam that it's turned on. I have checked my webcam permissions and I have those turned on for Skype and messages as well as YouCam. I have restarted the system as well, just in case this was a fluke, but it isn't.
In Device Manager there are no imaging devices shown on my laptop whatsoever. Doing a "Scan for Hardware Changes" doesn't discover it. I've already gone to the HP support site and there's not a driver to be found for the thing. I thought updating the YouCam software might bring a driver with it, but it did not.
I am absolutely positive that the webcam did work post upgrade to Windows 10, but it's clearly disappeared as a device sometime over the many upgrades. I am running Win 10 Home 64-bit, build 10586.420, on an HP 15-g035wm.
I won't wither away if I can't get this working again, but I find it curious that this particular built-in device has simply vanished and any of the conventional ways I know of to bring it back aren't working.
If anyone's got any ideas I'd love to hear them.