I suggest that you connect your monitor to your motherboard and start with the built-in graphics of your Ryzen 5 7600 to have a stable system that will allow you to further install drivers. Once running on the integrated graphics, I would download and install the currently recommended Adrenalin drivers for your RX 7800 XT GPU, which you can find here (the latest 24.12.1 Adrenalin driver is recommended for your GPU). After that installs, I would shut down your computer, move the monitor cable over to your GPU, and start it up again to see if you have a stable system that you can game on.
As Albert Einstein said, "I could have done so much more with a Big Al's Computer!".