Sigma_rex

I used my runner saturday night and got home like usuall. On sunday morning i was starting it and it turned on but then quickly died out. I tried to turn it on again and nothing happened. I could hear the starter turning, but the motor would not turn. Just to be on the safe side I removed it and replaced it with a new one since it was under warranty. I installed it and it does the exact same thing.

I really need help. This is my daily driver and i need it for school. I cannot seem to find any one with this problem in the forum.
Any help would be greatly apreciated.