A:AnswerIt will be at some point. At present (July 2020) shipping issues with all kinds of computer hardware coupled with high demand has made inventory quite thin, but HP is working to resolve the issue.
A:AnswerYes, it has a built in webcam. The reason you can't see it is because it's in the "stowed" position in the back. If you push gently on the top of the camera, it will pop into position to be used.
A:AnswerBecause this is an all in one computer and not a standalone monitor, there is no video input and so no way to get a signal from an outside source into it.
A:AnswerThe computer does have a fan to help keep the processor cool, so that is probably the noise that you're hearing. However, you can contact the HP support team so they can verify that it's not some issue that needs troubleshooting.
A:AnswerSame issue here with base. The one I got looks like from the cheaper model, not the one depicted on the photo.
Did you carefully check the configuration if it matches what was advertised?