Recently, my MacBook has been having some issues. Whenever I try to switch users, the list of users won't display; you can only see he regular starry background that's always behind it. Normally if I just restart it by holding down the power button it's fine, but I have some documents that I hadn't saved and really don't wish to lose them. Does anyone know how to fix this without turning off the laptop, or if that's not possible, how to prevent this from occuring again? I am posting this from my iPod. Much thanks to anyone who can help.