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the proximity sensor takes a second or two to realize you don't have the phone to your ear. just wait and it should pop up.
if you get too quick with the button pushing, basically the screen comes on, then sees you pushed the button, so it shuts, off, then turns on.
the moon goes into a dim screen with just the clock showing and moving around (good for a bedside clock since it's not bright.
the computer button goes into the same mode, but at whatever brightness the phone's screen was already set to. personally, i don't know why they have that mode there at all, seems pointless.