I have a new custom built computer which has onboard dvi and vga ports and I also have 2 ATI Radeon HD6450 video cards in it. I have 2 monitors set up running an extended display, but I would really like to be able to use 3 or 4 monitors in extended display setup. When I plug the 3rd monitor in, nothing is displayed on that screen and it just says "no input detected". My first two monitors are VGA and the third one is also vga. I've tried using a dvi -> vga adapter into one of the video cards and I've also tried directly connecting the vga of the third monitor into the onboard vga port and nothing works. When I try to go into the graphics control panel it only identifies the 2 working monitors. Does anyone know how I can get the third monitor to work with my setup? Thanks.