What would cause a Video Card not to display any video?

We are building a Server and we are using an AGP ATI 7000, the problem is that this video card will not display any video when a flat screen LCD monitor is connected, but it will display if a CRT is connected to it. I have tried changing the video display, the refresh rate and the color setting, but no luck yet. Is there anything I should check or is this Card just not gonna work with LCD flat screens?|||reboot into safemode F8 and see if it pops on .. if so i would get driver cleaner and redo the driver ... also go to the manufacturers website for the lcd and download the driver for the monitor ... that may do it ...|||of course it will work. your lcd monitor is not working thats all.