No communication between OBD2 scanner and vehicle

My car stopped starting on me. I replaced the starter and the battery, but that did not fix the issues. When the ignition is turned, all it does is click, under the fuse relay box in the engine compartment, and the starter clicks. I checked all the fuses.

My neighbor hooked up his reader, but it would not communicate. Is it the computer in my car?

Th engine cranks, but it will not start. It is getting fire to the plugs. The fuel pump and filter are new new.
The fuel pump is not getting a ground when key is on. I wired it to the battery and it worked great. Still would not start. I can pour fuel into the intake and it runs. Getting fire to the injectors but no pulse. I had a scanner hooked up and it said no communication between it and the computer. All fuses are good. All electronics work. Just will not start. Also, it has the ring around the ignition. Not sure if that is the problem. Was told that does not shut off the fuel pump though. Any suggestions would be greatly appreciated.

I work in the auto field and have access to more sophisticated equipment at work but needed to upgrade an older scan tool for home use. I decided to take a chance on this OBDII scanner tool. Still early for me but I have been impressed with the tool so far and would recommend to anyone with average to intermediate repair skills. For the money this tool is hard to beat.

So I have a question guys my buddy plugged in his 4k scanner onto my g35 coupe it does have a swapped motor. And nothing showed it was blank my uncle has the same car he plugged it on his and it read everything fine -. Could I be having a possible ecu issue? Car isnt throwing any codes engine light does illuminate when on accesory and car will start but wont stay on