Hi--I'm trying to install a Dominator FX 5500 AGP video card. Used to have a Rage 3D IIC PCI. I disabled the display adapter when I should have uninstalled the driver. Now I get a "Check Signal" message on boot when either card is plugged in. How can I get back to where I was before?? I can't get into BIOS. I never get that far. Please help me, good people! Thank you!!