My microphone on my acer aspire one isnt working. Whenever I record stuff on my webcam, there is

Question

Whenever I record stuff on my webcam, there is no sound. I know it's not a volume issue cause volume works on other things like youtube and music. How can I fix my microphone? I saw your answer to someone else's question, but I didn't know where the "my computer" button was. Thanks!

My Aspire One (Linux version)'s internal mic doesn't work with the build-in video recording program. I also tried an external mic. It also doesn't work...