No shutdown for macbook pro

[cool11]

My macbook pro, c2d 2006 model, refuse to shut down when I want to, most of times. I want to shutdown using the apple menu, doing it the right way. It displays only the backdrop image, I cannot see any circle in the middle of the screen showing me that it is going to shutdown, and thats all.
I have to press power button for some seconds in order to shutdown.

What can I do to find out what prevents mbp from shutting down?

 

[celticpride678]

If you go to Macintosh HD/Library/Logs, are there any logs in any folders. If yes, please post them.

 

[cool11]

I post a screenshot with log folder.
Which one should I post here?