It's a shame to hear an A3000 not working, but you have to remember how old these systems are now getting. they were never intended to be used as long as we have been using them for. In most cases it is simple amaizing just how much use we have into these systems!
I would clean every contact, all the chips legs, take a look and all the caps to make sure none have opened up, and then put it back together in stock form with no accelerator. See if that does it and good luck.
