Error message "psql: could not connect to server: No such file or directory"

Hi there,

I guess this is a typical user error. I searched around to find the solution, but in vain.

I just upgraded to Lion, and used Kyngchaos libraries for installation of Postgres.

Try to get running postgres, and I get this:

/usr/local/pgsql-9.1/bin/psql -U postgres
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

In my limited understanding, it seems that Postgres is not running. When I use:

ps auxw | grep post

out comes only the "grep post", but no postgres process.

When I use:

sudo launchctl load /Library/LaunchDaemons/org.postgresql.postgres.plist

it says:

org.postgresql.postgres: Already loaded

and displays in the "ps" list then:

user 935 0.0 0.1 2493888 7296 ?? Ss 3:24PM 0:00.12 /System/Library/PrivateFrameworks/DiskImages.framework/Resources/diskimages-helper -uuid 9EFB9424-7971-4A8B-9D73-B93BD7F1DB5F -post-exec 4

(which looks a bit strange to me (DiskImages ??))

I am somewhat lost (and worse is that it worked the other day, before re-installing Lion anew.).

Thanks for any hints,

Stef