I have installed eOS freya and I am experiencing shutdown problem. I cannot shutdown or restart my computer, to do so I have to press power button.I tried:

shutdown -h now
shutdown -P now
shutdown from the UI

When I shutdown it shows

[2969.600864] init: wait-for-state (plymouth-shutdownlightdm) main process (14172) killed by TERM signal

I also tried to change GRUB_CMDLINE_LINUX_DEFAULT /etc/default/grub and changed CONCURRENCY to none in /etc/init.d/rc. Still no luck

Do I have to press power button everytime or is there any solution for this? Secondly, is doing so safe?