USB not working

Arduino Leonardo eth, was happily programming unit. It then reported unable to program.
Windows reported unable to identify connected USB devices
Same error on different PCs & cables

Hi Emo, definitely sounds frustrating. It’s strange that it was working originally, but it could still be a driver issue rather than a hardware issue. Take a look at this thread on the Arduino forums and see if the method detailed a few posts down helps. https://forum.arduino.cc/index.php?topic=127801.0