|The video card/video adapter/video board is where you plug the monitor in to the computer. Most motherboards have one built in but you can add a card (usually if you want better video).|
That's for desktop PC's. I guess we haven't established if you have a laptop or desktop computer. If it's a laptop it should have an external video port where you can connect a separate monitor.
As Mike recommended, have you tried another monitor? I assume you have. My suggestions were based on you still having the problem AFTER trying another monitor.
I think the problem is with the video adapter but it could be some general failure with the motherboard itself or even something we haven't thought of yet.