A bit more information is needed.. I trust you've tried a fresh battery, a good adapter, & swapped cables. Have you isolated it from your other pedals? Does the light turn on at all?
Apparently it is NOT working.. maybe we can get to the bottom if it for you with more info.
Hard to give you more info. I can have it alone and on board. When it is off I got signal. When I turn it on, nothing. The light is on, but no sound at all..