With no new video card, you plug-in the power connection for video at mtrbd., notably the P4 connection from PSU. Use a VGA type connection for monitor and on-board video should have a display. If no display, then either the mtrbd. or PSU power lead for video is bad. You can reset the bios to defaults using the CMOS clearing so it can be at basics, just to have some display. If no display, then something is amiss, on what depends on your knowing if all connections are proper. The video P4 connection isn't the same as direct video card connections, so be careful or review your manual or guide for new video card. It should beep in protest is something is amiss, so be sure the spkr. is working too and/or connected right if not using an on-board spkr..

tada -----Willy Happy