Fuel injector or computer box 2000 nissan altima?

I have a hard problem that i can't figure out. I changed all the fuel stuff from fuel pump to fuel filter. still doesn't start. then i checked the fuel pressure and it's a 45 psi which is good. sparks are good. but now i stumbled on the injectors not having power so it won't spray the gas into the engine. i checked fuse and wiring and everyting is good would that mean it's the computer ECU not sending the signal to the injectors to fire? please help
Fuel injector or computer box 2000 nissan altima?
Take a look at the cam and crank sensor. If you have a problem there, the computer doesn't know to pulse the injectors. If anything replace them both.

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