You must have different connectors on your SGI monitor than I have on my SUNs I have 3 sun workstations. A SparcStation 10, 20 and Ultra 2. They all use a non-VGA video plug that connects to the CPU box. It is not BNC, I know what BNC connectors are and these are not them. This is one solid plug, it has 4 internal separate male connectors that look similar to phono plugs inside the main connector plug that mates with the female recepticle on the CPU box. We tried to connect our SUN boxes to an external VGA projector and had all kinds of trouble. We finally ended up using custom cables with 24 dip switches that had to be specially configured to convert the signals to VGA out to the projectors. It sounds like you have a different situation though so hopefully you will have less trouble. Greg