Hyundai U90D dual monitor mode does not work

[Guest]

I have two U90D monitors and I cannot run them in dual mode with Vista or XP Pro. I can run a Hyundai monitor and an HP monitor together in dual mode. The problem only happens when I hook the 2 Hyundais together. I run an HP 5850 desktop and an HP 5750 desktop. These are LCD monitors. Any suggestions?

 

[jaguarskx]

Use the video card driver to setup dual monitors; Catalyst Control Console, or nVidia Control Panel.