Security stays on?

I have the car listed above, it won't crank and the security light is on and it stays on. it does not blink and i have tried disconnecting the negative battery wire and a few other ways i have seen on the internet with no luck. they all say that the security light should blink but mine does not, it stays on the whole time. Is if i replace the key and the key tumbler will that fix it and will it start again? I don't know what else to do, it's our only car and don't have the money to get a new car. please if there is any way to bypass it or anything? i would be forever grateful thank you and hope to hear back soon. .fingers crossed. shawn fox .