Can not record sound from my laptop

I have been using Audacity to record computer-generated voice for two years and worked fine. Recently I downloaded the new version and set it as before but can not record voice from my computer anymore. When I start recording, it is pure flat… I have no problem listening to music from my computer but just can not record that sound.

My audio setting was “Windows WASAPI”, “Microphone Array (intel smart sound technology)”, and “speakers (intel smart sound technology)”.

Does anybody know how to fix it?

Thank you!

Perhaps counterintuitively, you want to set your recording device to Speakers/Headphones (loopback).