Clear your CMOS with the jumper and try again. If that does not work try another video card. If you are installing a PCI video card then i assume your computer has no AGP slot and no PCI Express 16x slot. you did not provide information WRT your motherboard. Some low cost computers dont come with AGP or PCI Express 16x slots. if you do have a AGP or PCI Express 16x slot avilable then it would be best to get a low cost card for one of thoes slots and improove the chances of detectabilty by your BOIS. now you said "built in" do you mean intigrated? if not intigrated video i.e. solderded on the mother board did you remove the old video card? if the old video card is still installed because it has other ports on it that you want to use (crazy but i have scene it) you will still need to remove it because it is being detected by the BIOS as the primary video card.