I have replace the spark plugs, the cables, even the ignition... its new, it cranks but it doesn't start... what can it be? HELP!

Do you see any engine light on? Check error code if its on. If its not check fuel pump is working or not. Probably you can hear between back seat and trunk area.
One person turn on the key( all dush light on but don't turn to starter position) and another person go in trunk and try to listen some motor sound. Usually the sound has 3 sec (depending on a car).
If you have hear the sound fuel pump is working. Next you can check fuel pressure.


You can also check they has spark or not. No 1 cylinder has little different ignition coil take out coil and spark plug and reconnect the wire to ignition coil and attached spark plug to ignition coil then end of spark plug grand to engine.
Next one person crank the engine. Make sure nothing close to drive belt and fan may have injury so.