Is your friend's nMP shut off, or just sleeping?
Is your's also in the same mode (off - or sleeping)?
If completely off, is your power cord plugged in to a power strip, and is the power strip turned on, or off?
Maybe your friend is getting power from the bus, such as a powered storage device attached?
Or, if everything is the same, and your panel doesn't come when you move or turn your nMP - it may have some other situation which would be worth a call to AppleCare for a quick answer.