I am experiencing a strange persistent chiming sound from my computer and ended up closing all apps, notification sounds and even rebooting, it was driving me mad as there was no other visual indicator of where it was coming from. Eventually I narrowed it down to the fact that it only happens when I'm here. I thought at first it must be chat notifications so have disabled sound in Messenger but am still getting these annoying sounds, where are they coming from and how do I disable this? It's extremely irritating!