1. Check the laptop's power settings. Some laptops go into energy-saving mode when the camera is idle and can prevent the camera from powering on when needed.
2. Make sure the camera is not disabled in device manager.
3. Ensure that the camera is receiving adequate power by connecting it to an independent power source if needed.
4. Confirm that the camera drivers and software are up to date.
5. Make sure to double check security software settings and disable any setting which may be blocking the camera.
6. Check if the camera is correctly connected to the device.
7. If the camera is physically blocked from the lens, remove any physical obstacles.
8. If nothing in the prior steps resolves the issue it may be necessary to reset the laptop.