Hopefully someone here can help me out with my problem.. I've tried searching this forum as well as others and can't find anything similar. I've had the combo for about 6 months and I like everything about the amp except for what happened today. I plugged in, flipped the power switch on and everything seemed fine, until I turned the volume up on my bass and got no response. I thought maybe my cable was trash, so I tried another one as well as trying another bass with the same results. I'd like to take the head out of the cab so I can check the fuse and the input jack, but I can't seem to figure out how to get the friggin' thing out, it's like it's machine pressed into the cabinet. There are 3 screws on each side and nothing else seems to be holding it in place.. Before I get my crowbar out, does anyone know something about this combo I don't? Another thing I noticed was it was making a weird popping sound as it was turning off the last couple times I used it.. Normally it has a little thump when I shut it down.. the pop was a little different, not really loud or horrible sounding, just different. I didn't think much of it until now. Anyone else have a similar problem with this combo? I'm on my own here, I bought the amp used but NEW in a sealed box from somebody that already had one b200r, mine was a spare/backup. So in other words, no warranty. Thanks. Oh yeah... I never switched the speaker input to the "no horn" setting like the other people that were having grounding issues. Makes me wonder if I did actually set it to "no horn" if mine is another defective model!