You could try putting an hdmi cord into your motherboard and then use your cpu for graphics. After your computer is on you can check your devices to see if your computer recognizes a graphics card is hooked up to it.
If there is nothing about your graphics card then your graphics card is dead. If there is then I would try downloading the newest drivers and the newest drivers for your motherboard as well because it could be your motherboard who has outdated drivers.
Hope this helps