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when booting in os x after the first boot chime immediately hold down keys <apple,option,o,f> all at the same time and allow computer to boot to open firmware once there type "reset-nvram" exactly like that but without quotation marks and press enter once it returns to command prompt type "reset-all"and press enter (you must have the "-" in between the commands) the computer should restart if not when the command prompt returns type "reboot" and hit enter .....
also you can check the drive status by going to "system profiler" in apple drop down menu--->about this mac-->more info or applications folder-->utilities folder--->system profiler then selct disk burning under hardware in the list on the left
You want to go into your AUDIO/MIDI set up in OS X. Selet the unit. YOu have a MAC so most itmes dont needs drivers, its one of the many great things that separate that operating systems from say windows. Also your yamaha may be CLASS COMPLIANT, which means plug and play no matter what computer you are using.
What you should do is make sure the keyboard is set to send on the same channel as garageband is set to receive.