I have experienced that exact same thing with my H9 Max. Bought the unit brand new last May. No problems until yesterday when the unit would not power up at all. There was no variable in the set up that changed. Always used the power adapter by Eventide (9v DC at 500mA) that came with the unit plugged into the wall. The unit just inexplicably became a brick. Hopefully the problem is with the power adapter and not the unit itself. I sent an email to Eventide support, but have not heard back.