So first things first, I'm not very good at computers here so don't expect me to know much or to do a lot but I'll try my best.
I just plugged in my graphics card from a friend and was expecting a big FPS boost because its quite an upgrade from what I have, I think it's a RX 570. Anyway my FPS didn't seem to change at all and when I asked him he said it was stuck running the APU. I would've assumed that it would automatically switch to the graphics card and not run off the APU but I must of plugged something in wrong or done something, even though it seems fine. I don't want to have to manually switch it from the APU to the graphics card instead would rather fix it so it automatically switches back. Sorry if this doesn't make too much sense but I'm really not sure either.
Sorry about that, I didn't see it. I really don't know how to even find half of the things required though but if you really need them and you told me how to I could find them possibly.
I don't know how to check my power supply either.
My computer is seriously old so I don't know whats in it especially.
But from what I know is that I have done all of what you said on there.
Slight problem, my PC is linked through an Elgato which I use to record videos and the Elgato is plugged into my main computer screen, a old laptop that controls whats being recorded and the PC. There's another screen that is directly plugged into the power board and the GPU though.