I had one that had a loose connection in it. you can pop the casing on it open. make sure the wires are connected.

Kien, I have one of the power supplies that has the litle black thingamajig attached to it. The ppwer supply is dead but I would imagine the little thingamajig still works. You're welcome to it if you want me to send it to you. Only difference is that it is a power supply for a wavebox, not sure if that matters? Also I'm not sure if you would end up having to just buy a new power supply either, I'm not sure of the electronics of all those parts but it sort of looks like the thingamajig is an integral part of the powersupply setup.

Yeah I recall that being part of it. If it's the same as the one on the ends of my 6101 it can open up. I don't remember exactly but I thought it was a very tiny little pcb and a few contacts. I'm hoping it's just a loose connection.