What does it mean when you try to start the car but the security light keep blinking and it won't turn over it won't make a sound?

Could be a couple things that come to mind:

1. The key you are using isn't "recognized" by the onboard computers. In some keys there is a little microchip of information that has special codes.

2. If your battery is low enough, the lights will flash and you might hear an audible "clicking" noise, but there isn't enough amperage to turn the flywheel.