My car is not starting. I checked the battery and starter they're fine. on 1996 Oldsmobile Cutlass Supreme

I got a new key made with a chip but it'll go into the start position but not fire. Someone said it might b the ignition column but that sounds really expensive. What should I do any suggestions?

Start ok with the old key?
It did up until now when it stopped starting.
Ok, you turn the key to start and the engine will turn (crank) but not start at all right? Or does it start then die? Or it does nothing? May not even be key or switch related!
It does nothing. The security light flashes which makes me think I had to reset something since I had the battery out for awhile
1 more answer , 1 more comment
ck both battery cable connevtions at each end
Ok connections r fine. I'm actually trying to reset the alarm now.
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