I'm assuming the engine cranks over with the starter, seems to start for a second or two then dies.
Does the message centre have a flashing "SECURITY" message?
If so, you have a Passlock II problem.
To get it running you'll have to do the 10 minute relearn procedure, or if that fails the 30 minute relearn procedure. I could post both procedures if you like.
To fix it so it will never fail again you will have to:
1) bypass the sensor in the steering column, or ,
2) hardwire (solder) the 3 wires to the sensor, or ,
3) replace the sensor.
This last option rarely works due to the problem being in the connector contacts, therefore my preferred method is either option 1 or 2. (I really wish GM would fix the contact issue by using gold flashed contacts and not crummy tin plated ones which tarnish over time)
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