Same here with 470.57.02. Happened after a PopOS update. Intel graphics only and non functioning HDMI. Same computer (4k OLED version). First I thought the NVIDIA chip was broken but put back the original Windows 10 SSD and everything was running fine.
Unistalled PopOS NVIDIA drivers:
sudo apt remove nvidia*
Installed version 465.31, downloaded from nvidia.com:
chmod +x NVIDIA-Linux-x86_64-465.31.run
sudo ./NVIDIA-Linux-x86_64-465.31.run
And after a reboot PopOS is running perfectly with NVIDIA GTX 1650 Max-Q graphics again.