I then did a factory reset, which got the machine running, but shortly after that it wouldn't come back on. Does "it wouldn't come back on" mean that nothing lights up or shows on the LCD or do you mean something else? I'd take a close look at the power supply voltages. Do you have the factory wall...

I recently purchased a used Alesis SR-16 for repair. The unit wouldn't power on at all initially. I opened it up to check for any obvious problems and everything looked good. I then did a factory reset, which got the machine running, but shortly after that it wouldn't come back on. Would anyone know...