Disklavier

> Before I bother a technician with this, hoping that it might be a simple
> fix on my part, I have the following to report:
> 
> My Mark III (DC1A) is not working properly.  The only thing it will still
> do is play piano (only) from disk.  The CD does not work, and none of the
> instrument voices are accessible.
> 
> My nephew turned on the piano yesterday, and I'm wondering if he may have
> done something upon start-up that I can easily undo?
> 
> Thanks for your advice.
> 
> -John Gewartowski