Is the security light on?
If so, try the BCM key chip relearn procedure.
Turn the key to run only.
Leave it in Run for a minimum of 10 minutes.
Turn it off, remove key, reinsert, try to start.
96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 192k miles and counting.
Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 189k miles