I have a 1GHz G4 running OS 10.3.3 with a nVidia 4mx video card with dual monitors connected. I am using a Griffin Technology ADC to VGA converter to connect a Samsung monitor to the ADC port. The monitor works fine, it just won't go to sleep along with the monitor connected to the DVI port. It just flashes "No Video Signal". If I turn the monitor off it gets confused and I have to restart the computer so that all of my icons come back and it displays in the proper resolution. Does anyone have any ideas on how to get the monitor do go to sleep and function properly?