Roland A-800PRO has stopped working

Just out of the blue my MIDI controller has stopped functioning. There is power getting to it as the display is lit up and states Version 5.535.
 
The transpose and octave up/down buttons are usually lit up red but these are all off.
 
I've tried USB cables, re-installing the drivers but nothing. Is there any buttons on the keyboards that I may not be aware of that might stop this keyboard working or has it just died?