I have a Power Mac G4 Dual 1.25. It has the ATI Radeon 9000 Pro video card, and I want to connect 2 displays to it. I have an Apple Cinema HD as my main display, and an HP display as the one I want to add. The HP has a VGA cable, so I bought a DVI -> VGA adapter for it, and the Mac recognizes the HP. However, the HP monitor is telling me that it isn't receiving a signal. What's happened here? Do I need a second video card? If so, recommendations?