I work at a small public access TV station. We have a G4 iMac which I would like to connect the video output of into our switcher. It has a mini-vga port on the back. Would Apple's mini-vga to s-video/composite adapter work on this computer? Their item specs only list the G5 imac. Did the G4 iMac not support this output? I'd like to know that this will work before I plunk down for the adapter. thanks much.