2001 i just replaced my ignition system on my 2001 acura tl now car wont turnov

What is your question?

one day my key would not turn. i went and got a used ignition switch unit with key. now the key turns but wont start up. a locksmith came out to look at it and said i have to reprogram whole system.

What makes this problem better or worse?

nothing

How long has your 2001 Acura TL had this problem?

a week