Can't turn off Bluetooth

Just realized that I can't turn off Bluetooth on my iBook. If I go to the menu bar, the "Turn Bluetooth Off" item is dimmed. The "Turn Bluetooth Off" button in System Preference is also dimmed.
What's going on here? Can anyone help me out?

There are no bluetooth devices connected to this computer. As well, when I look in the Bluetooth preferences in System Preferences, it says that the Device Name is Unavailable.

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