Color-less Classic -- A friend at Apple notes that Color Classic users can move the contrast slider bar in the Screen Control Panel all the way to the left, making the screen go pitch black. It would seem that users in that situation are stuck, since they can't see the slider bar any more, but pushing the screen contrast button on the Color Classic's front bezel will bring the screen back up.
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Verify Turned-Off Apple Wireless Keyboard
Can't tell if you've turned off your Apple Wireless Keyboard to prevent it from waking up an iOS device or running down its batteries? Tap the Caps Lock key, and if it illuminates, the keyboard is on; otherwise not.