the keyboard should always come on with the grand piano sound. If not, you've glitched something. Hold down the highest white key while turning on the unit and this will initialize the keyboard back to it's factory settings. You will not loose anything in the user memory when you do this. After doing this you should be able to turn off the keyboard and then on again and you will hear the piano. If not, you've got a problem!
George Kaye
Kaye's Music Scene
Reseda, California