Unable to boot or display on Nvidia 3070

Hi all. Having an odd issue with Bazzite on my desktop PC. I've used it before on my AMD laptop and a refurb optiplex with RX6400.

Specs:
Ryzen 7600x
Asus B650E-F
RTX 3070

I've tried:
bazzite-nvidia-open
bazzite-gnome-nvidia-open

Basically everything goes fine until the install is complete and it reboots. After post, grub appears, starts loading whatever the default image is, then [EDIT: see updates below] it just resets back to bios before the loading image/spinner appears. I've tried with secure boot enabled/disabled.

Any ideas?
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