shutdown doesn't shut down

[Gary Stainburn]

On Wednesday 04 February 2015 13:11:26 Ralf Corsepius wrote:
> Hi,
>
> on several machines, I am observing that
>
> # shutdown now
>
> doesn't shutdown and halt/power off.
>
> Instead, these machines shutdown and immediately reboot.
>
> Any ideas?
>
> Ralf
>
> PS.: I am only observing this issue on UEFI machines.
> My BIOS-machines all shutdown/halt/poweroff.

Try 

shutdown -h now

The -h means halt

look at

man shutdown