Check to see if the laptop camera device is open. Right-click My computer → admin → Device Manager to see if the camera is off. is closed open on it. Here you can also check the other point, is the camera driver, camera driver for the notebook camera is very important. The camera must not be used without a driver. If there is no camera driver, you can go to the official website to download the latest driver or update the camera driver, and then restart the computer to see if the camera can be launched.
If you open the Device Manager, there is no camera in the inside, you can see that the computer did not find the camera device. Need to check whether the connection between the computer and the camera is good, you can plug and pull to see whether normal.
Take a USB jack camera and plug it in the computer to try it, if the external camera can be used, then hundreds of laptop cameras are damaged. Then you can replace the new camera at the place where the notebook is repaired. If the external camera is also unusable, it may involve the circuit above the motherboard.