Well, if the onboard video isn't working at all, then you'll have to install the new video card first, then go into the BIOS, make the changes, and save them. There shouldn't be any conflict between the two devices while still in the BIOS.
Some mainboards also have jumpers for selecting the onboard video and audio, so take the time to check your mainboard manual for information like this.
Be sure to select which type of card will be used while in the BIOS, PCI or AGP.
By the way .. if the onboard video on a mainboard <i>did</i> suddenly just stop working, I'd want to know why. And that might involve taking the system to a local shop and having a diagnostic run on the board.
Toey
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