For anyone else, if you do a factory reset and wipe out your personal data it will reload the os and work ok. IT would be nice to figure out what app or tweak causes the issue though.
I have the same problem. Tried 3 times now to reload, system screen blacks out during boot, and nothing wakes it up. I can see the phone in the file manager on the pc, but i cannot access it.
I have a pixel 3a, seems to be functioning well, bu t cannot find a methodnfor routing calls over the wireless? is thatbsupported yet ?