I have a Dell Optiplex 740 that I'm using to test Windows 7 on. I have 3 video cards total. 2 are PCI cards and 1 is integrated. Windows sees the Integrated in the device manager but when I go in to the display control to change resolution I cant choose it to extended my screen to. It doesnt even show up in the selection. Only the 2 other cards. I went into the bios and made sure it wasnt disabled, I made sure the right drivers are installed, the cable is plugged in, and the monitor is on and has power. What else could be wrong?