Hello MacRumors Forums!! I have a problem with my Macbook Pro on Mac OS X Lion. The Problem is normally like this: I turn on my Macbook, do some work, leave it on for some time, and when I try to click on something, it doesn't respond. It doesn't even go to sleep! When I close the lid, and when I open it, it's still stuck. So the only option is to hard shut down it. hard shut down is when you push the power button for a long time, and your Mac shuts down, no matter what. I'm putting this on Mac OS X Lion, not Macbook Pro, because it didn't act like this on Mac OS X Snow Leopard. Thanks for the help!!