Dave Smith Instruments SYNTHESIZERS

This morning I made the stupid mistake to see what would happen if I changed contrast in 
the global menu. I turned the knob and nothing happened, turned again and suddenly all 
that once was viewable is gone forever. Turned the unit off and on once and now I seem to 
get nowhere at all.

Sorry for being as stupid but is there a way to restore everything including all global 
parameters to how it was when I bought the unit ... ?

Sorry for being utterly stupid but I'm lost outhere,

Martin