In the BIOS there are two settings for the graphics controller: PCI and AGP. Selecting PCI will power monitors connected to the PCI and AGP and it will power the internal LCD. Selecting AGP will only allow use of the monitor connected to the AGP. Select AGP only if you wish to get the max resolution and you only need one monitor. The bottom black monitor port is PCI and the blue port next to the parallel and serial ports is the AGP.