My rig has been nearly silent since the day I got it. I have never had a noise problem at all. My bass electronics are quiet and my amp is silent. Well today I got my new (new to me) preamp and hooked it all up, and then it starts...that damn 60Hz. So I dismantle my rig and try all kinds of configurations, different outlets/locations, etc, and now I'm down to nothing but my Carvin power amp and my cabs, and I still got that damn 60Hz! I tried ground lifting, bridged, stereo, parallel, whatever. I even went through my house and started turning stuff off to see if it would go away...it didn't! It just won't go away. What would cause this to happen?? I have NEVER had this problem before! I turned on my crappy Ibanez practice amp and it has no noise at all. Any ideas???? Is it my power amp? It's still under warranty BTW. What else should I try to pinpoint the problem??? Thanks for any help you give me.