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I had a bunch of non-responsive keys after storing the M50 on its back for about a year. Try this: Strike the two keys on either side of the dead key simultaneously and repeatedly. Eventually your non-sounding key will come back to life - it worked on every one of my dead keys. It may take 20-30 ...

I also stored my keyboard in a hard case for about a year on it's back (the surface with all the jacks facing downwards parallel to the floor). When I next fired it up, a whole bunch of keys in the middle of the keyboard wouldn't make a sound. Clearly it was a mechanical problem, because I could ...

This exact same problem happened to me. I had stored my M-50 for over a year in a case with it lying so that its back (where all the jacks are) was towards the floor. When I took it out to use it, a whole bunch of keys wouldn't sound. Here's the good news: you probably DON'T have to take it apart ...