Thanks.
This was not working at first when I first powered it (after years) but then finally worked a few minutes ago.

I wonder if this is a PRAM issue as this does not retain my system time or if some keys got not good. I managed to test the command key with using the cursor. This is an old reflex I had when I had a faulty mouse on my Amiga and it seems the MorphOS devs provided the very same behavior :)

I am running the Apple Hardware Test ATM. If this passes well, I will attempt booting the 3.15 burned DVD.