My hunch was that `shutdown now` to `shutdown -p now` works same as `halt` to `halt -p`
Which is wrong, as `shutdown now` doesn't shutdown the system/machine but only system services: "When the shutdown command is issued without options the system is placed in single user mode at the indicated time after shutting down all system services." http://man.openbsd.org/shutdown I admit my mistake and waive the second part of my message. Yet, the first part still holds unresolved: machine runs for 4 seconds only after any of: `shutdown -p now` `shutdown -hp now` `halt -p`