I have an ASUS desktop. I have my monitor plugged to a video expansion card not to the onboard video slot. One fine day when I turn it on, theres no video. Fine, I say. And I buy another video card and replace the old one. Still no dice. I next check and blow out the PCI-e slot with compressed air to dislodge any dust. Out the video card in, still nothing. Its a Radeon video card. I then try to see if the onboard video slot will work so I plug the monitor into there. Still nothing. So can I fix this somehow