Test the ignition system for spark.
No spark,check the coil pack/module assy
Also could be
Camshaft position sensor
Crankshaft position sensor
Broken Engine timing belt.
Wiring..open ignition feed,open Ground circuit
Security system is always a possibilty.
Is fuel pressure within specs? test fuel pressure if spark is present.
Fuel pump circuit does have a relay..just as an FYI....
Does the engine crank over and not start?
Or when you turn the key ,it wont crank?
Lots of possibles...need to test it all or take it to a qualified shop..no offense..dont know your mechanical capabilities...