I have a Quadrasynth Plus, and when my screen went blank it was right after I was on some carpet setting up for a gig, and I shocked the board. It was a noticeable shock. Screen was blank, it still worked, I just couldnt see anything. I took it to get fixed for about $200, but left it in there for a whole year and racked up $350 more in storage fees. So all thats to say, it might be static electricity.