I have a little problem, I let my drive get too full. And then while I was deleting rows to free space, the auto vacuum didn't kick in quite the way I expected, and I ran out of space entirely. So the DB shut down and won't start back up.
What message it has written in DB server log file (pg_log) about it not starting again ?
You can check the last lines of the recent log file under $PG_DATA/pg_log location, which give very good information about why it has not started.