I have a problem that started a few nights ago, when I turn on my amp, I get no signal from the Bass. I switched from Active to Passive input on the head, but that didn't help. I started to remove the cord from the bass, and my amp popped (just about knocked me down). I figured the Bass might have problems with the active pickups, but now every time I turn my amp on I have the same problem. If your amp is on, and you dont have the cord in the jack, shouldn't the amp still receive a signal? Doesn't really act like problem with cord, I have had that problem in the past. But I cant tell if its in the Bass or the Amp. New cord, new bass, new amp. Tried different cord, same results. Hartke 5000 head, 4.5 XL Cab, Shecter Elite 5 Bass. Any help before I load this thing up and take it to my nearest tech?