03 Rendezvous WON'T START!!!

I have a 2003 Buick Rendezvous with 95,000 miles on it. I try to turn the key and the car won't start. Full power, Good Battery, Cleaned connectors, Tightened connectors. Also the security light, battery light and Trac off light comes on. My uncle checked the starter and it works fine. He took off the underneath part of the steering wheel and the ignition switch is loose. Could that be it? I just don't know what to do. Please help!!!!

Welcome to AF, this not a something that can be diagnosed from here, if the security lite stays on the passkey system is the issue, leave the key on for 10 minutes turn it off then try to start it.

Thanks so much! I got a key made from my vin # and it turns out the person who sold me the car gave me a key that wasn't cut right! Now the car starts perfectly!