From out of nowhere, the usually dependable K40 C02 laser started making An unnerving sound like it’d been possessed by a poltergeist. When your laser sounds like it’s from a horror movie, something ain’t right. While I had my suspicions about the cause, what follows was the process used to diagnose and resolve the problem. The following is a blog post about the pain-in-the-arse experience I went through to eventually fix this misbehaving K40. Hopefully this may help out anyone else who might experience a similar issue.