I know, onboard sucks, right? But it's a good idea for back-up. Anyways, if you have onboard video, in the bios you can set the display adapter to your card; in Win, set your card as the main display adapter (this may or may not be necessary); then nothing will be displayed via the card till Windows boots.
I know, lots of people want some kind of image as soon as possible. But this way is far less hassle for the sacrifice of so little bling.
Consider it high comedy....sincere tragedy....whatever...don't take it personally.