What Kazoo said. Get the switch out and look behind it. THey might have tied the white wire off behind the switch.
I would also encourage you to go out and get the Black and Decker basic wiring book. You can get 'em at just about any hardware store. It's very well put together and will help you identify and work with just about anything you'll face in normal jobs.
And of course, never forget that even when you shut the breaker off, you should consider the power to still be on and take appropriate precautions.
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