How to set up an external display the main display?

ACER5920 my notebook on picked up a PHILIPS 20-inch monitor to boot each time, but only after VISTA into the screen to take the BIOS boot times and the system is re-how is the black? Thank you ~ ~ VGA interface is ~

graphics driver software installed on the tray.Above should be able to set up.Bios is not the dual-display support , The only notebook display.Into the system, in the Display Properties drop-down display set up in the second set displays the main display.