See a previous post. https://www.experts-exchange.com/Hardware/Laptops_Notebooks/Q_27534054.html
I thought I had this issue repaired but it appears to have some hardware problems. The issue is, sometimes when booting up I will have a blinking cursor in the top left hand corner of the screen and the machine will not boot. When I'm able to get it to boot I can no longer access my integrated webcam. If I look in device manager I don't see the camera. Its as if it is no longer physically installed. The problems started when I connected my external wireless mouse.
I've since then used the wireless mouse on another system for a long period of time and don't have the same issues.