Some time ago, I had my laptop repaired and the motherboard replaced. After a while, I started to wonder where the sound went. Today, I was bored of not having some kinds of sounds, so I popped the laptop case open and discovered that the technician who had replaced the motherboard had forgotten to replace the cable for the loudspeakers. (Though, to call them loudspeakers is quite an exaggeration. They make sounds, period, nothing more.)
After replacing the cable and closing the case, the laptop was a happy beast again, now with sounds coming out of it. It’s annoying that those who fixed it didn’t do the job properly, they probably have a check-out list of some kind which the forgot to follow, or they were just being lazy.