I have looked all over for the monitor driver for this GDM-20E21 Sony monitor. It isn't even available from Sony or Sony support sites. This is a 21" monitor used by Silicon Graphics for CAD/CAM manufactured in 1997. It also has a 15 pin vesa connector for std home pc use. I have a Compaq Pentium 4 pc with Nvidia 64 Mb graphics to run it on. I checked the Silicon Graphics web page also.