It wont start ot turn over when you turn the key it dont even make a sound

turn headlight on - either with another person or facing a wall.
try starting. If lights dim it is a bad battery ot connection to the battery.
If not it is in ur starter ckt - relay, starter motor, starter solinoid.

sounds like time to change Ignition switch in steering column

Check for power at the big cable on the starter motor. The little wire should have power when key held in start posision. If have power to them have someone hold key in start poss & give starter solinoid a knock with hamer if no go knock starter body. If go when knocked need new starter

Sounds like the ignition cylinder is going bad.

Check for loose or corroded battery terminals. If thats OK, there may be a problem with the starter itself.

HAVE TO TAKE TO DEALERSHIP.SOUND LIKE THEFT DETERRENT SECURITY SYSTEM GOING BAD.COULD BE WORN IGNITION KEYS OR FAULT IN THEFT SECURITY MODULE.DEALERSHIP HAS TO USE A DIAGNOSTIC SCANNER TO FIND THE PROBLEM.

sounds like the ignition lock cylinder has gone bad call a locksmith.

if you are not hearing the pump turn on there's a good chance that its the fuel pump most gm's have a faulty wiring on the fuel pump harness id check the relay and wiring if theirs power to the pump but not crank that would be it id get a gm pump not a carter better to use oem

check all the fuses and the wire that goes to the starter and it is usually purple check the relay

Try this Put your key in turn it on dont start wait 10 mins remove key wait 10 seconds repeat this a total of 3 times. If that dont work try a different key do the same thing. If that dont work a dealer needs to probably replace and reprogram your ignition switch and keys