Chosen Solution

I just replaced the starter and alternator and my car still wont start, wont crank, wont turn over at all, when i turn my key absolutely nothings happens except the buzzing sound from my fuel pump nothing else

Test the battery. Typically, if it is the starter, when you turn the key, you will hear clicks. If it’s the battery, there will be no sound. Maybe the solenoid? It sounds to me like a power issue. Does your car have a fuse or relay for the starter or ignition?