Why is my pro rattling or humming?

My PS4 Pro is buzzing…

Here is the link to hear:

https://twitter.com/...89568?s=19

What could that be?

Coil whistling?

My uncle has that too. I don't know much about building a ps4 pro, but I think it's simply because your pro is hot and the fan is dusty.

Open them up and clean them. You can find a tutorial on YouTube.

Sounds a lot like a worn fan bearing. You can use it while it is still running, but if it suddenly breaks, your PS4 may not shut down in time and you will grill the console.