Total Vanity: Curious Computer Incident

Not sure what to make of this, perhaps people more knowledgeable about computers than I can add some insight: I opened up my Lenovo laptop, I had not shut it down over night, just closed the screen. I could faintly hear music and some background noise. It sounded as if I was listening to a phone, that had been left off the hook with the line open. I had no programs running. I then shut down and restarted. Problem went away. I do subscribe to a computer help system that has in the past come into my computer to resolve...