PostgreSQL error 'Could not connect to server: No such file or directory'

Check there is no postmaster.pid in your postgres directory, probably /usr/local/var/postgres/

remove this and start server.

Check - https://github.com/mperham/lunchy is a great wrapper for launchctl.

For me, this works

rm /usr/local/var/postgres/postmaster.pid

postgresql osx-snow-leopard homebrew

"Postgres.app" is a better fix if you are on OS X

Here is the fix:

CodeHunter