Maxima engine cranks but no start?

Check the coil packs. And I know this sounds not normal, but check for fuel in the tank. Check the fuel line and filters. I am assuming that it sounds normal when it turns over. If not, check the timing belt.

Make sure that when you attempt to start, the security light doesn't come on; if it is it might be a nats problem, meaning you inserted a wrong key in the ignition causing the ecu to lock.

If you can give me a bit more info, I could hopefully be more specific.