1. Check Permissions
The most common cause is blocked permissions. Click the lock icon in your address bar and ensure 'Camera' is allowed.
2. Close Other Apps
Apps like Zoom or Teams might be using the camera. Close them completely.
3. Hardware Check
Ensure your webcam is plugged in and no privacy shutter is covering the lens.
4. Update Browser
Ensure you are using the latest version of Chrome, Safari, or Edge for best compatibility.