A friend's mother has been having trouble with Zoom. The webcam works fine but there is no output audio from her laptop. I talked her through a few diagnostic steps, the main one being to have a look at Device Manager. There is no microphone listed. When she opens Zoom she gets a message saying that no microphone has been detected. Is it possible that there isn't one installed? I naively thought that all laptops had one but I could be wrong. She says it's a reconditioned laptop over 6 years old - she can't find a model number or even a maker! I did all this over Zoom with her on the other end of the phone so sorry that the information is a bit patchy. It's a Win10 machine with all updates done (allegedly). I've suggested a plug-in USB one which seems the best solution.