I Have a Lenovo s405 with built in WebCam, but it doesn't work. Does anyone know w to fix this?

I Have a Lenovo s405 with intergraded WebCam, but it doesn't work. If I open lenovo YouCam it says no webcam detected, if you are using an intergraded camera make sure that it is turned on. Same thing when I open the CAMERA tile on start it says connect a camera. I don't know how to "turn it on" and in device manager I don't see any camera or image option so I don't know what to do. Please Help. Im stumped

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