instead of pulling out the GPU, you guys can try to reset CMOS.. I faced the exact same issue with Z490-G, reverting to motherboard firmware 1003 and enabling resizable BAR worked.

I can confirm that my Z490-G Wi-Fi on 2005 and ROG Strix 3080 on VBIOS_V4 gets stuck on POST when I enable resizable BAR.. had to turn off power and reset CMOS for system to POST again.After reading the response here, I did a BIOS flashback for the m...