Bluetooth disappeared after a restart...Says theres no hardware. MacBook UB

Hi guys,
I am new to Mac, and this MacBook is my first one to own. I recently had to hold down the power button, because my computer would not respond, or wake from the screen saver. When I turned it back on, the Bluetooth icon in my menu bar, was gone, and so was the System Preferences pane. Do you guys have any idea what happened? I also searched in Spotlight Bluetooth, and opened Bluetooth Explorer. It said there was no Bluetoth hardware... I recently have installed the iPhone 2.0 free SDK, if that helps. I do have regular Time Machine backups to a USB external drive. Thanks for anything, Ryan.

Thanks for the solution My bluetooth works after trashing my plist and resetting the PRAM.
However, it is only a temporary one. Every time I close my MacBook lid to put it to sleep it does not wake up at all. I have to force shutdown by holding on to the power button for a few seconds and restart.
Upon restart, my bluetooth disappears again. This happens every time I put my MacBook to sleep by closing the lid. I am lost as to why this is happening.
Now I have to shutdown completely all the time. Hopefully the bluetooth issue will not crop up again. But Apple should do something about this problem soon.
Thanks again.

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