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

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1 answer 2 comments
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.