Need help..No comm. w PCM/BCM/TCS etc.

I had a customer bring a car in today. He had a dead battery and jumped it off to drive it. After that he says that the car would crank and drive, but all of the lights on the dash were on. All of the gauges aside from the tach and alt. gauge do not work. I checked for codes and got no comm with all modules. I replaced battery with a new interstate and still no comm. I checked all grounds and still no comm. I need something else to try.
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