I have an AMD Radeon HD 6700 series video card, and the AMD Catalyst software controls my displays. I have a VGA monitor plugged into the graphics card, and that is the only display that works. I have a DVI port and an HDMI port on the graphics card, as well as a mobo integrated VGA port, DVI port, and HDMI port (which I find strange). The mobo integrated VGA port doesn't work, and neither HDMI port works. I don't have a DVI monitor to test the DVI ports.
The AMD Catalyst program won't autodetect the other displays, and I've tried to force them to be recognized, but I can't do that either. I've fooled around in the BIOS settings, but can't find anything there, either. My drivers are up to date, and windows 7 recognizes AMD Radeon HD 6700 as my display adapter. If you need any more info, tell me where to find it on my computer and I'll gladly give it to you.