This is driving me crazy: I have several centris 650 machines and a Power Mac 8500/120. The radius BW monitor (TDP 19, 0218) has the standard cable with the standard Mac 15-pin (two row) video connector. Connect the monitor to the Centris and it works perfectly. Connect to the Power mac and all you get is a few diagonal lines on the screen. I looked up the pinout for both machines and they are identical. The radius came with a floppy disk that loads sofware, which loads on the Centris. Load it on the Power Mac and it says the Radius control panel does not operate. Is this the cause of the monitor's failure on the Power mac?