This is what I get with the same command on a perfectly good working F16 system:
BASH:~/-> sudo systemctl status plymouth-reboot.service
plymouth-reboot.service - Show Plymouth Reboot Screen
Loaded: loaded (/lib/systemd/system/plymouth-reboot.service; static)
Active: inactive (dead)
I don't have any problem "rebooting" my machine. Don't let seeing "(dead)" in many of systemd's service status reports lead you to automatically believe that service is a "problem".
---------- Post added at 07:23 PM ---------- Previous post was at 07:14 PM ----------
At the command prompt, as root, you should be able to do either of these:
This is how I poweroff my laptop, which I boot into runlevel 3 mode.