Apple iPods 101 - Manual (Page 56)

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playlist, the iPod shuffle always starts over, for the sake of
simplicity, which makes this tip work. (It also works on
other iPods if you turn on repeat all in the settings. But
other iPods have screens, which makes them somewhat
easier to navigate).
The Lights on your Shuffle
The iPod shuffle has two subcutaneous LEDs on the front to
help you figure out what it's doing in the absence of a
display. There's a green light, which is mostly useful when
you're listening, and an amber light that is primarily needed
when your iPod is connected to your computer. The lights
give you reassuring feedback that all is well, or help you
figure out when something is wrong. Here are some of the
most important iPod shuffle light shows:
 Usually, when you press any button, the green light
will shine as long as you hold down the button.
 If you press a button and you see the orange light
instead, and nothing else happens, your iPod is
locked. Hold down play/pause for a few seconds to
unlock it.
 If absolutely nothing happens when you press a
button, not even a light, you probably need to charge
your shuffle's battery.