So, finally got my Ryzen 5900x together today. Everything went pretty smoothly, other than I had to Q-Flash the BIOS to get it to post initially. I kept getting an AD code, which I eventually diagnosed as an out of date BIOS(I got the Gigabyte Aorus Master B550). Q-Flashed BIOS, got Windows installed, updated, etc. I started installing drivers from Gigabyte's site and my computer randomly restarted. After restart, it won't post. I keep getting error code 90 and the VGA led light is lit up on the MB. I pulled the CMOS battery and I'm giving it 15 minutes before popping it back in and trying again.
Any ideas? Brief reading on the internet makes it sound like it's a dead MBoard, CPU, or possibly both? As I don't have another CPU/MB, I can't really test either one to find out.