The anti theft system has been triggered. I would call your local Chevy dealership and ask them how to reset it.
its vary simple place your ignition key in the ignition turn the key to run wait 10 minutes for the security light to stop flashing it will be on steady do not turn the key off
with the security light on steady turn the key to start the car will start and run let it run
for 3 minutes
if this failes the resistor attached to the ignition switch has failed .
go to a auto recycler and get a replacement ignition switch with a key
install the resitor on your switch and repeat intsructions above
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