PG错误无法连接到服务器:连接被拒绝，服务器是否在端口5432上运行?

I recently updated my machine (MacBook Pro running Mountain Lion) and ever since then, whenever I set up a rails project, my machine craps out and cannot connect to PG. Currently, this is the error I am getting when I try to go to localhost;I recently updated my machine (MacBook Pro runn