Today, motherboard-integrated graphics are basically gone (in the consumer sector, anyway). It’s either CPU-integrated graphics or dedicated graphics. Both Intel and AMD still sell CPUs without integrated graphics, even with the same socket. If you install one of these, you won’t be able to use the display connectors on the motherboard.
In the past, CPUs ...
There has to be a graphics controller in the system somewhere. That graphics controller needs fast reliable access to a section of RAM to use as a frame buffer.
Depending on the system, the graphics controller may be in a few different places.
A seperate device with its own dedicated ram.
Integrated as part of the CPU
Integrated as part of the chipset
It sounds like there was either a short circuit or ground fault. Try plugging the graphics card into another computer and see if it works. If it doesnt, it is most likely dead. If that is the case, your best bet is to try to replace it under warranty.
Starting with version 1803 (April 2018 Update) and later versions, Windows 10 features a new section in the Settings app, which also allows to specify the preferred graphics card for traditional desktop and Microsoft Store apps to improve system performance or battery life.
To force an app to use a discrete GPU instead of the ...