Based on your description, I recommend you the following:
1- Check the monitor cables.
2- Access Safe Mode with networking by pressing F8. By doing this, the computer should boot and you should see image with the minimum drivers the operating system needs to boot.
- If you accessed Safe Mode, install access the following link to download the driver for your controller at the following link:
In the case that you are still no getting video, my best recommendation is for you to contact the computer manufacturer for them to guide you with troubleshooting steps on your board.