Hi guys, I own a Px-860 which I purchased 2 years ago, and when I went to turn it on a couple of days ago, there was no sound emanating from the speakers. I find it very weird because when I plug in the headphones there is sound on the headphones..   I haven't done anything different to the piano. The only thing I could think of is that I had not turn on the piano for about 2 weeks, but it was fine back then.   What I have done to fix the problem is disconnect the power suppl