Hopefully someone can help me! I'm afraid that in haste in the partial darkness (I'll save the reasons, but I was in hurry and not thinking), I plugged an AC adapter into TWO of my four working perf/x units, and now they won't respond. I've now spent two nights trying to isolate the problem and repair with parts from another partially functional/broken perf/x box. After confirming the regulator was bad, I replaced that in one of them, but it still doesn't work.In searching for the problem I've found that Continuity checks around the board very rarely light up any of the LEDs, mostly no response, whereas my partial working one (another story) will light up all or some or just one of the LEDs.What's with the power supply switch section I can't seem to figure out the path the signal follows before the switch, and this area is the trouble spot of the partially working one (that other story) Thanks N