|Some motherboards automatically disable the onboard video when you insert a video card. If yours doesn't, pull up the BIOS setup program by tapping the Del, F1 or F2 key before Windows starts loading. On most systems it's the Del key. |
Find the menu with the integrated graphics options. It's usually in the Chipset Features, Integrated peripherals, or Advanced Features menu.
Set the integrated graphics to Disabled, or 0MB (graphics memory). Save and exit. Attach the monitor to the new graphics card, install the newest drivers, and enjoy your now super-mega-accelerated graphics.
Socket 939 | Dual-core Opteron 185 @ 3.2GHz | 4GB | 1.0TB | Win7 x64
GeForce GTX 460 1GB | X-Fi Ti Pro | A8N32-SLI Deluxe | Antec P182