This happened recently to my 94 SL320. Started fine then all of a sudden nothing. Just all the idiot lights lit and the roll bar button beeping and flashing. John Hef, a Master Mercedes Mechanic and member here found it was a fuse. Make sure you check all your fuses for corrosion and reseat them. Hope this helps.

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99 ML320
94 SL600
92 SL500
95 E320 Cabriolet
87 560SEC
86 300SDL Grease Car
80 380SLC Euro

13 Fiat Abarth
02 Maserati Spyder Cambiocorsa
00 BMW Z3
90 Rolls Royce Silver Spur
80 Ferrari 308 GTSI
88 Jaguar XJS12 H&E Edition
99 Land Rover Discovery