Car won't start
 

My car was running this morning it wouldn't start I replaced batteries fob locks and unlocks but car won't start. I have 07 g35s

Is it possible that you ran out of gas?
Check for spark
Check for pressure from your fuel pump
If you are unable to perform the above perhaps you might be better off having AAA flatbed your vehicle to the nearest Infiniti dealer and pay for a one hour diagnostic check

Good luck

There's a security indicator LED light on the left side of the dash, when you are cranking the engine if it's SOLID RED then the vehicle doesn't recognize your key. Sometimes the BCM just has a heart attack and forgets the key transponder ID code and needs to be reprogrammed.

If that's not it I would add 1 gallon of fresh gas just to rule it out, the gas gauge is notorious for failing and showing 1/2 tank even though it's completely empty.