I was setting up for tonight's Karl Denson and everything was normal. I was going to run a third set of mics > MixPre-D > MixPre-6. Everything was working, getting levels on the MixPre-D & on the MixPre-6. I moved the battery for the MixPre-D, and everything went dark on the MixPre-D. I have no idea what happened. I switched cables and batteries, but no juice was flowing. I got home and started trying to figure things out, but I am not having any luck here either. I put a couple of AA batteries in the -D and I get the green power light, but nothing else. None of the lights come on except the power light when switched to INT. I tried to find some troubleshooting for this, but I haven't had much luck. The manual doesn't seem to offer much in the way of help, and I am not really sure what to do next. I'd like to have a night out where everything goes according to plan, but I don't think it is in the cards for me anytime soon. Any ideas, tips, or suggestions would be most welcome.