car wont start

[ek_coupe]

ok i got a thinker even though i know what it is i dont... i found an 02 maxima for sale at a repo yard for 1700 dollars...clean too and an se...the bank had the car there for almost 8 month because they didnt know how toget it started...me knowing those cars have immobilizer systems and the lady never turned in the key i bought it...i take the car to the dealer they program a key that i bought at the very dealer and the car wont start.. i figured i could troubleshoot the rest so i checked the fuses..got power under hood and dash...traced the ignition switch wires...power got fuel...got power to the injectors...got power to the coils....no signal and no injector pulse...where does that come from...the computer...called back the dealer they said i needed a new computer im like wtf??? no way u didnt program the key right...anyways i got my money back but i dont wanna take it to them cause theyre stupid but i cant figure out the problem without their computer...any suggestions???