Been using this guitar without problems for several years. Now suddenly, it will not power up with an external power supply. It works okay with the battery. I have tried two different JTV power supplies (both the switching unit and the DC power units), and I have tried to power it with my old HD500, using the Variax cable. None of these will power the guitar. I am stuck with the battery, which is ok, but having no back-up leaves me vulnerable.
I have tried this: I inserted a 1/4" plug into the guitar and turned it on with battery power. Guitar comes on. As soon as I plug the other end of the cable into the JTV power supply, the guitar shuts off.
Any suggestions?