2000 mustang v6 wont start?

my 2000 mustang v6 wont start after a short that burn the remote wire, after the smoke went away i was able to turn it on but after 30 seconds it just turn off on me as if it had no gas. I replace the remote fuse and nothing happens, and when i turn the key, the battery, heat and oil wont move at all. I left the key on for like 5 Min's and the oil, battery they move as if it was gonna turn on, but wen i turn the key they just go down as if battery was dead but its not. Its an optima so it cant be people are telling me that the computer might of broke. and the keys they have a cheap, the car cranks but it wont start. or the computer got deprogram and that i just need to reprogram it.