Follow these steps to troubleshoot your camera or webcam issues:

1. Verify that the camera or webcam is connected correctly to your computer.
2. If you have multiple webcams, make sure that the one you want to use is set as the primary.
3. Check the camera or webcam settings.
4. Restart or reset the camera or webcam.
5. Check if your camera or webcam is compatible with your computer.
6. Install any available updates for your computer.
7. Remove and reinstall the camera driver.