Can't Shutdown iMac

[egear]

I have a 2011 iMac and when it go to shut it off the screen turns grey then stays like that, (10.7.2, 500GB HDD)

 

[808?]

Does it repeat the same issue once you reboot?

 

[alksion]

Hold down the power button.. Not the saftest thing, but sometimes the only means is a hard shutoff.

 

[egear]

Does it repeat the same issue once you reboot?

It does it every time