Hey guys, I was just about to start practicing today through my Hartke 410XL and HA4000 and there is no sound coming out of the cabinet. I plugged a different amplifier (for my PA system) into the cabinet and I got a sound. I ran my HA4000 from its "tuner out" output into the inputs on the PA through the cabinet and got a sound. So, I'm assuming that somehow the speaker outputs on my HA4000 are not working. Any suggestions? No warranty... as the amp isn't being made anymore and it's almost 10 years old. Maybe it's time for a new amp? How is the HA2500 or HA3500? I'm fairly poor. Thanks everybody!