Despite that there are USB video connectors for computers without HDMI(like All-In-One, etc) that can work with external screens or TV.
Would you not expect that the drivers would need to be successfully installed prior to having this issue? Despite my question, Windows 10 does seem better than Windows 7 for auto detecting new hardware + supplying a driver.
Sure wasn't.. He has broken it by listening to people like you. He thought flash bios was going to show more ram and now it shows nothing. He will need to do hotswap bios recovery likely.