My MacBook is set to go to the screensaver after 3minutes and then the display is set to go to sleep after 4 minutes and it is set to ask for a password to wake from sleep or screensaver. Anyway, sometimes I'll walk away from my computer for a long amount of time (maybe an hour or two) and when I come back the screen will be all black so I think it's asleep. However, when I tap the keyboard it goes right back into OSX without asking for a password or anything. Is it suppsoed to be like this or is my OSX messed up? Thanks.