Please help: I have two old vga monitors. One of them plugs into my VGA port on the video card and works. The other plugs in via a DVI adapter to the DVI port on the video card and doensn't work. The monitor lights up when I plug it in so some interaction is happening, but it doesn't get detected by Windows 7 or Catalyst Control Center. Please help. Should I use an HDMI to VGA adapter instead of using the DVI port for the 2nd monitor? Thanks.