replace the switch on a 95 thinderbird still nothing happening any suggestions thanks is there something loose in the colum thanks

First check take off and clean cattery cables and terminals and put back on. Then check battery has power. Then disconnect a battery cable again and remove starter to test it. If starter is OK put it back and cable back on. Next check fuses and fusible links. If it doesn't crank - do you have power? Enough power for headlights? Does starter click under hood of car?