How to program a key for a 2008 Pontiac Grand Prix, without having the orignal.?

Justin C

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I bought the new key from the dealership. They said to turn it to start and then leave in run postion for 10mins and wait for the theft light on the dashboard to blink. It never did. Also turn to on postion for 10 mins then back of and back to on postion 3 times still nothing.
 
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