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If those don't work, you need an auto locksmith with a scan tool computer to pair you key and spare key. If you only have one key, get him to make you another.
This is a very common problem on GM vehicles. The security system is known to fail. Basically when you insert your key, the system checks for certain OHMS resistance. If the system cannot get the correct signal from the key, it assumes the key is incorrect and goes into SECURITY lockout mode. (prevents hotwiring) This has been happening with GM;s for a very long time. There are ways to bypass this now. Read through this page for info, solutions as well.
The security light blinking is the problem, you must get control module scanned for fault codes to diagnose the issue or you can bypass the system if you understand basic electrical systems . Just google bypass passkey system.
You can physically Hot wire it, but the theft system will stop you from driving it. You can read/learn about a bypass system here. http://www.diy-gm-security.com/
There are several things that can cause your engine to not have spark. It could be a crankshaft position sensor or the circuits to the sensor, it could be the security system "thinking" that the car is being stolen and has the ignition system locked out. It could be the ignition voltage circuit to the ignition coils, etc., etc....
In any case, your ignition system must be diagnosed to find the cause. This would include scanning the computers that control your ignition and security systems for possible fault codes.
First off, sorry that happened. That key can run anywhere from 75 to 150 bucks. There are ways to bypass this system so that you can use any key. Its probably good to just bypass it anyway so that it doesnt end up failing on you down the road. These system are expensive and out dated. Here is a link to understand how the system works and ways to bypass this yourself.
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