This problem has not been solved. My machine switches on with no sound about 50% of the time. I only have the one elektron machine so power supply is not the issue. Generally I just leave it playing and at some random time in the next ten minutes the sound magically comes back. I’m wondering whether it is related to the known Toms bug as generally when the sound does come back one of the toms is playing a long sustained note that was not programmed into the actual pattern. Hope Elektron get this bug squashed (fingers crossed its not hardware related).