Mine did the same thing. Just by chance we had a universal laptop power supply unit with interchangeable tips made by powertran & my wife said to give it a try. The unit has a display window on it & it reads 16.9 volts when the zoom is running. When I plugged it in I couldn't believe it was going through it's start up menu. On the package it says 15 - 20 volts DC 90 watts & I reckoned it shocked the zoom into working again...well anyway, it worked & the zoom is running again. The power box package cost $89AU that I got at an electronics store.