I changed my ignition cylinder on my 97 Chevy Tahoe because I have lost my keys as I got them replacing it and put everything back together the car started flying I was driving later that day my car stalled and would not start again when I turn the key the car makes no noise no clicking sound and it will not start also when I put the new ignition cylinder in my car stays in AC mode and will not go past it. I need answers and help so I can get my car back on the road so I can go to work I am confused as to why the car would not start and stays and the same like I said it makes no noise

 

The issue might be with the ignition switch connection or wiring. Double-check all connections and fuses related to the ignition system.

 

If that was the only thing that was done, that would be the cause of your issues.