Hello, I have been looking all over the internet for an Apple Monitor Geometry Adjustment Cable for the Power Macintosh 5500. The Apple Part Number is 922-1513. This cable will allow the screen to undergo geometry adjustment. One end plugs into the video analog board and the other end goes to the modem port on the back to of the computer. Then you turn the machine on and through software you are able to change the screen geometry. Please let me know if you have any of these cables laying around. Thank you.