2006 Buick Rendezvous Ignition switch

Hi:
If the key doesn't turn, the tumbler may be bad. I have even see cases where the key was worn to a point it would no longer work. Try a different key if you have one. let me know what happens.

Joe

I have tried both keys and neither works. The steering wheel is not locked either. I am afraid the transmission may not be in park, but with out the ignition switch being able to turn the shifter can not be moved either.

If you were able to remove the key the last time it worked, it should be in park. With everything you described, it truly sounds like the tumbler assembly needs replaced.