My 07 350z died while at red light, now it won't start
 

I need help! My 07 350z died on me without any warning or nothing at a red light, I've changed the fuel pump the crank position sensor and still nothing.it will crank right away but it won't start all the lights in dash come on when I'm cranking it and stay on. Please help I just purchased this car I would like to drive it.
Code reader won't connect with car as well.

Welcome- start by getting a code reader and plugging it into your OBD2 port (located under the left side of the dash). Use your Z's onboard diagnostic system to pull codes from the ECM (electronic control module).

If you're not even able to connect to the ECU, then in all likelihood, you've either blown your ECU fuse or the ECU itself is bad. Check the fuse first (for obvious reasons.)

I second fuses. Do the lights/radiator fan turn on immediately when you put the ignition to on?