Car won't start

[richthofen]

So the intermittent starting difficulty of the past month or so has, as of this afternoon, graduated to a car not starting difficulty. Turn the key and the starter motor engages, but the engine never fires. This can be repeated several times with the same results. Standing near the fuel tank, I don't hear the fuel pump engage, so I'm wondering if it might be the pump or the relay. Security light was not on before but is now--could have something to do with it?

Thanks for any assistance, as this is highly annoying!

2000/2.4/166K miles.