Mine died as well. It was a G0720 and it had been in sporadic use for two years when the board died. My mill was already out of warranty so I had to shell out $ 400+ for a replacement. I did try to find another source because I could not believe that a board that had only seen less than 20 hours of use would fail. The motor does exist as a stand alone with its built in position sensor but the inverter board was not available in single quantities. My new board has been working since its installation but I have been wary of using the E Stop switch to stop the motor given that the inverter board failed when I pressed the same to stop the motor. Good luck with your search. If you do find another possibility please post your findings.