I am sorry to piggyback your tread but I see that you did some research with this model so I have a question.
Every time I power it on it turns on different setup randomly. Everything is scrambled but every time in a different way and no keys are responding. Sometimes sound is played and some rhythm played for a second and different led lightened.
Considering that it wasn't used for years, possibly decades I figure hard reset might help. As I saw on some page one guy has installed a hard reset button. Can you please tell me if you stumble upon this info which points on the mother board should be shortened for this hard reset.
Thanks.
