heating and air on 1992 Mercedes-Benz 600SEL

after leaving my car in the garage for one year, now the heating and air conditioning display will not come on(dead) and there is no way to control ac/heat althaugh if I drive it I will get hot air from vents but not regulated by the fan that I can not control due to no active display .

Asked by for the 1992 Mercedes-Benz 600SEL
I have the same problem , any answers