I have had this keyboard for 8 years and it has been used very lightly (when my mother comes to visit she uses it to practice occasionally). However, now I am trying to use it as a MIDI controller and audio keyboard with Cubase. I have connected it before and it appeared fine, but today when I switched it on the display panel just says "Error in CPU data transmission" and it does nothing more. Looking this up on the internet I have heard to switch it off for some time and turn it back on again. I turned it off at power for about 30 minutes and tried again and got the same error. I have also read some recommendations to perform a hard reset from the program menu. However, this is not possible as I cannot get into any menus as the keyboard is totally unresponsive. After so many years of virtually no usage it is annoying that this has happened just when I have some meaningful tasks for it. I would be grateful if anyone can offer any advice to rectify this situation. Many thanks.