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Is the car an automatic or manual?Do you have a test light or volt meter to do some testing?
Usually if you aren't getting any sounds when you try to start it, the issue is with the neutral safety switch on the transmission. Try putting the car into neutral and see if the engine will crank.
As for your question about the security, it is possible it's got you locked out, but usually you can hear the alarm relay clicking when you turn the key and try to start it. I suspect the issue is going to be the switch on the transmission, however without any way of testing it, it's impossible to be 100% sure.