h.boydy40 :
I just got a new graphics card with evga rma , I plugged it in turned the computer on and there was no power to the usb devices . and the screen did not turn on, the cpu light turns on for a second when booting but i dont think its a problem, and then the vga light turns on, i have an msi x370 gaming plus and ryzen 5 1600x so no integrated graphics obviously
You probably got the wiring on for the USB or simply forget to plug it in altogether. Look closely.
As for the black screen. Your HDMI cable is plugged in directly to your GPU - correct? Because it won't work if you plug it in the motherboard directly since there's no integrated graphics.
Don't worry about the light. It's only a problem if it stays on.