I am having a problem with the display on a Lenovo B575. When the computer is powered on, the display is black, no signs of color. It works without a problem when connected to an HDMI monitor. I changed the display, but the problem remained. I then changed the lcd video cable. But it still only works on the external display. When I changed the video cable, I noticed that when it comes out of the motherboard it also connects to the camera just above the display. The cord splits, with one end going to the display and the other to the camera. I then downloaded a Lenovo camera app, and to my surprise the camera works. Any help with possible solutions or suggestions would be great. Thanks.