#1
what is up with these...
it seems they are very picky on the power and if u use the wrong power adapter it'll turn on but not output any sound

tried 2 different matching power adapters, doesnt work (the real power adapter not fake)

anyone else had issues with this - the digitech tech support guys just said send it in for 50bux to fix
#2
It's not worth more than $50. It's a really old unit.

Could be something as simple as a bad connection in the connector. I had a GNX3 that the ground tab in the connector was bent and not making contact. Does the connector feel tight or loose when you plug it in?