From mccoyn's Reddit comment: "The isolated grounds was what I thought it was while reading the story. I bet when this was installed, there was a problem with

From mccoyn's Reddit comment: "The isolated grounds was what I thought it was while reading the story. I bet when this was installed, there was a problem with the sound buzzing. Isolating the grounds would make it go away, like magic. But reconnecting the grounds while the computer was on would create a sudden ground change that might crash the computer, more magic."