I have a DVI to ADC adapter (model A1006) that was used to connect an Apple 15inch LCD Studio Display to a ATI8500 in a G4 dual. Recently when I powered the system up, the LCD display did not light up. I connected a CRT to the VGA port and that worked, so I am presuming the video card is OK. While trying to troubleshoot, it sounded as if the DVI to ADC adapter is making a clicking sound. Does anyone have any troubleshooting or advice?