Starting troubles

Car was working perfectly like seriously you could not ask for anything to run smoother. Nothing sounded bad ran smooth. One day I parked it and stopped working. The engine rotates, acts like it is about to start but does not reach that point. I have tried disabling security system that did not work. I have tried resetting security system that did not work. I check to make sure engine was getting fuel that was working great. I checked compression that was also great. I checked spark plugs and everything those worked great. I do not understand what could possible be wrong.