Postgres.app Could not start on port 5432

Question

I\'m using http://postgresapp.com. In the menubar it gives the error \" Could not start on port 5432.\" Similarly if I try to start the server from the terminal, I get:

Answer 1

If you've installed Postgres via another method (for example, from www.postgresql.org) and it's starting automatically at startup, you can prevent that Postgres from starting via the following:

sudo launchctl unload /Library/LaunchDaemons/com.edb.launchd.postgresql-X.X.plist  
sudo rm -f /Library/LaunchDaemons/com.edb.launchd.postgresql-X.X.plist  

TIP: use tab to autocomplete after the com.edb.launchd part to figure out what version is loading.

Restart Postgres.app and you should be good to go.

(from http://forums.enterprisedb.com/posts/list/1831.page;jsessionid=70621DC48C99EDE663A6A594B05F1A02#6782)