For some reason I cannot shut down my PB. at first i thought it was nothing, just an app running over, but that was weeks ago. software updates have fixed nothing too. What happens is, like normal OSX starts to shut down. the dock, menu bar and desktop all vanish away leaving just the mouse and the desktop image. only it freezes on that. It seemingly can go in and out of sleep mode, I can move the mouse around but thats it. Anybody else had this or know of the solution?