Car wont start nor turn over wont even crank? on 1990 Mercedes-Benz 300CE

Just bought starter whats the next thing it wont even turn over wont crank put key in everything comes on i hear fuel pump kick in im lost

Asked by for the 1990 Mercedes-Benz 300CE
Time to let a mechanic take a look. Lots of stuff could be your trouble.
i did he said maybe ignition switch
Then try another mechanic without a maybe answer.