Replaced battery and Key FOB battery and car still won't start
 

I have a 2008 Infiniti G35 journey with around 102,000 miles. I replaced the battery and also replaced the battery in the key FOB. My car still will not start. Any suggestions on what the issue is?

Does the fob lock and unlock the doors? In other words, does the car recognize it or has it lost it's "registration"?
Original fob with key for the car?
Worked fine before you replaced the car's battery?
Try sliding the entire fob into the "Intelligent Key Port" left of the steering wheel and see if that works.

What problem where you having before that caused the battery replacements? Are you getting any power at all now? Is the new battery fully charged?

I am going through the same problem. I am hoping I need a new starter