Press <esc> when it prompts for the password - that should give you a text console, so you can follow the boot process - and if it fails at the ‘starting Qube XXX’, you can edit the boot, to disable autostart of the Qubes:
that should give you a running dom0 and enable some debugging.
I find the probleme,
it was my pc that have one ram slot half-dead.
I do some memtest and find that the memtest don’t crash if i just use one of both slot with 8 or 16go.
So i can’t have 32go one this pc but it work fine for me now.