I want to have dual monitors. Why isn't my HDMI connected monitor not working?
Unless you have a graphics card that supports two separate monitors, you're sadly out of luck. The video card you have now has the two different ports to allow you to use one monitor or the other but it's not going to do what you want. A dual monitor card will probably run you about $200 and it's quite easy to install. Having two monitors, however, will spoil the hell out of you. =)