Hello - Can anybody help me. I started the night playing a midi-file and then the volume was going up and down. So I shut the keyboard off and it never came back on. I check the power chord and it works with another yamaha keyboard therefore it's not the power chord. It won't come on at all - any suggestions?? Uncle Dave please call me tomorrow at 914-906-1206. Anybody else have any ideas what to do?????? Please help me