"Nvidia utility says card not found although emblem on card lights up "
Male sure that you've connected all required PCIe power cables to it.
The onboard should be disabled when graphics card correctly installed.
Welcome to the forums my friend!
Follow each and every step in this guide first: https://forums.tomshardware.com/thr...ng-about-post-boot-no-video-problems.1285536/
Especially making sure it is connected up correctly.
Following that if your iGPU works but the RTX doesn't I would be tempted to RMA the GPU.
If you can, try it in another system and see if it works.