Qubeos 4.2.3 fresh install stuck after entering successfully luks password

[apparatus]

There seems to be a problem with NVIDIA and new kernels:

Not booting with Linux 6.6.48 but still booting with 6.6.42

Hi, Since the last system updates QubesOS doesn’t boot anymore with the new default Linux. After showing GRUB, instead of starting the boot process, the screen simply shows the blinking underline character and nothing else. When I’m interrupting GRUB, I can navigate to the alternative boot entries and at least the second entry is still working (Linux 6.6.42). Not booting: Qubes, with Xen 4.17.4 and Linux 6.6.48-1.qubes.fc37.x86_64 Still correctly booting: Qubes, with Xen 4.17.4 and Linux 6.6…

Try to boot with nouveau.modeset=0 kernel command line option.
If it’ll boot then you can try to install the older kernel 6.6.42 and use nouveau or try to install proprietary NVIDIA driver in dom0 instead of nouveau.