Out of nowhere my Yamaha UX16 USB Midi connection from Keyboard to Macbook pro has stopped responding. Both Logic and Garageband acknowlege a usb connection into the program yet no signal is received from the Keyboard. I feel like I've tried everything. Clicks and Ports, Midi In cable to Midi out Port on keyboard and vice versa, Audio/Midi setup, refreshing the inputs, reinstalling the driver for UX16 Yamaha...and to no avail. Can anyone help?? I've hit a high wall. Perhaps the midi ports on the keyboard have gone bad(not likely but a possibility) Prompt feedback would be very much appreciated. Thanks guys.