Hello everyone. I have a macbook pro early 2011 running Mac Os X Snow Leopard. When I do not use it for a long time (like for a night) it becomes unresponsive. I mean when I touch the touchpad it lights up and I see my desktop and dock. But the menu bar is gona. And none of the dock items or harddisk icons on the desktop work. They are clickable but that does nothing. That situation makes me restart the computer by pressing and holding down the power key. What should I do?