Here are some checklists

✔ Software keys to turn on the microphone

In certain computers, there is a function key button that you need to press to turn the webcam on. For example, for Lenovo laptops, it will be "Fn" + "F4" key

✔ Hardware switches to turn on the webcam

Look around your laptop, sometimes there is a toggle switch to turn your webcam on/off

✔ Allowing microphone use in browser

When you entered the classroom, did you "Allow" the use of the camera?

✔ Using the Chrome browser

Are you using the Google Chrome browser? It's the most reliable in getting your microphone working. If you don't, you can download it here

✔ Windows/Mac settings menu

Is Windows/Mac configured to use the correct microphone?

✔ Installing a proper external microphone headset driver

If you're using an external microphone headset like a logitech, you may need to install the driver first. 

✔ Plugging the external microphone headset in, and turning the power on

You can try plugging/unplugging the microphone, and find out of there are an on/off switches

✔ Quitting other software that uses the microphone, such as Skype

Software such as Skype may get in the way of the browser being able to use the webcam. 

✔ Refresh your browser page

Sometimes, reloading the page may help enable the microphone to work

✔ Rebooting your computer

Rebooting a computer, especially Windows, sometimes can get a microphone to magically work

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