I have a macally BTMOUSEJR that I used successfully with an old Powerbook G4. Now i have a MacBook Pro running OSX 10.5. Not sure how to connect my old BTMOUSEJR to it. The BlueTooth Setup Assistant says: "The pairing attempt was unsuccessful. Make sure your mouse is in range (it's right next to it), turned on (it seems to be; there's a blue light on the scroll wheel), and discoverable (what's that mean?)." I don't really know what to do differently?