Magic Mouse & Bluetooth Keyboard Won't Pair in Lion I have a new macbook pro 15 inch 2011 model. My magic mouse and bt keyboard won't pair. The keyboard doesn't even get detected in the bluetooth settings. How can I get them to work together?

I have bluetooth enabled and tried using Setup Bluetooth Device to pair them.
I don't think this is your problem, but it might be and doesn't seem to have been raised elsewhere.  I bought a new MacBook Pro running Lion a few months ago, and found that the (also new) Magic Mouse would not connect automatically—I had to force it to connect after any disconnection from switching off the MM or from rebooting the MacBook.

One of the genii at the Genius Bar, after ½ hour of experimenting and in the process of telling me that Lion would have to be reloaded, suddenly realized that the MM connected upon being clicked.  He stated that he had not run into this before and that it must be a new feature in Lion related to battery preservation.

Bottom line, try a single mouse click to initiate the Bluetooth connection.