postgres startup blues: pre-existing shared memory block (key 5432001, ID 0) is still in use

[Dan]

Nick Urbanik wrote:

> HINT:  If you're sure there are no old server processes still running,
> remove the shared memory block with the command "ipcclean", "ipcrm",
> or just delete the file "postmaster.pid". 

Does a postmaster.pid or postmaster.5432.pid exist in /var/run? If so 
you could try deleting that.