Using a new PC, and a GEO 600, 16 camera card, I have experienced a problem that has me puzzled. This setup has 12 cameras. 11 cameras work just fine. Camera 12 has a great picture when viewed on a cctv B&W monitor, using same coax and placed at the same place as the PC. However, when I plug the camera into the GEO card, it brings down most of the other 11 cameras. I remove camera 12, and all is OK. Same thing if plugged into any other input. Can anyone offer any input on this? Thank you very much. Robert