A few things to check. Is the "security" light blinking after you insert the key in the ignition switch? If yes, it is your immobilizer.
If not, then check fuel and plugs for spark. If all else is well, try removing the battery terminals for some time and reconnecting, that will reset the ECU. Happened to me once, when the crank position sensor(?) was not being read correctly by the ECU. Spent hours trying everything, fuses, wires, plugs and fuel pump etc. It only started after resetting the ECU through battery disconnection.