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
init: wait for state plymouth shutdownlightdm 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?