Sim card not detecting in s Advance mobile.

Hi,,
My self valli.
i have been using Samsung galaxy S advance mobile since 2013 i have updated Jelly bean 1 year before but two days before it was suddenly showing insert sim , later i flashed corbon rom 4.4.2 it was working 1st time when i inserted sim card after i have changed sim card its not working its showing again insertsim now i have upgarded to cynogenmod 4.4.2 rom even now sim not recognizing:( , i ahve done this procedure through recovery mode. Can any help on this..

Thanks in advance.