Aye aye aye,
Thanks for the ultra fast answer!
Problem Solved! I disconected and reconnected the cables and Voilà! (still strange as the box is never moved around).
Also strange as yesterday I was seeing the cache drive online (empty files when opening it, which made sense to me).
Thanks again!
-Miomio
Note: In order to learn 'diagnostics', where did you see so fast this was the cache drive?