Here are some checklists

✔　Software keys to turn on the webcam

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" + "F7" 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 webcam 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 video 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 webcam driver

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

✔　Plugging the external webcam in, and turning the power on

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

✔　Quitting other software that uses the webcam, 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 webcam to work

✔　Rebooting your computer

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

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