I no longer use Yamaha keyboards because of something simular. I had two PSR 3000's and both had motherboard problems. I also had the same problems with four(4) Tyros before sending the last one to California to be repaired under warranty. Since then, knock on wood ( my head) it's has been working fine.The Yammies are the best for the buck, but no good if not reliable. I am now using a PA80. hope i have better luck with it. Bob