Bruce, what you're experiencing is exactly what happened with my previous pc. For me, the problem was corrected by disconnecting, reconnecting and taping the cable connection at the rear of the pc (someone else on this forum suggested I do that). The camera cable connects to a longer cable in the empty space inside the back of the pc. I unscrewed the top tail light below the camera, and pulled the cable up until the connection appeared. There's plenty of slack in the cable to do this. Once I did that, the camera/monitor worked perfectly.