Can't get any display on a new PC

Hey everyone, Got a new PC that POSTs perfectly (I have no OS and it stays on BOOT), but I get no video output on any monitor.

Tried basically everything (multiple HDMI/DP cables, all GPU ports, 1080p + 1440p monitors, an old TV, 1 RAM stick, reseating RAM, Clearing CMOS). It seems no matter what I do I can't make it work.

Specs:

Ryzen 7 7800X3D

MSI B850 Gaming Plus WiFi

Sapphire Pulse RX 9070 XT

32GB DDR5 6000

KC3000 NVMe

At this point I’m wondering if the BIOS is outputting UEFI/GOP in a mode none of my displays can show (heard this can happen on some MSI AM5 boards until BIOS update).

I’m a bit nervous about doing USB BIOS Flashback, but I don’t know what else would cause flawless POST + zero video on every display.

Does this sound like a BIOS issue to you guys? Anything else worth trying before flashing?

Thanks so much on advance.