I got a Alesis Recital 88-key digital piano. When I try to plug it in and turn it on the power light goes blue when I push it but as soon as I take my finger off it goes out and I have no power. If I use 6 D batteries I get the same result. If I hold my finger on the power button it stays lit but I cant get any sound out of the piano. Is this a bad power supply/board or is there an easier fix for this? I don't want to go through the hassle of returning it so I'm asking here first.