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PCM was showing O2 sensor error. Mechanic said it was PCM. I ordered a new replacement now jrrp will not start. Power is good but when you turn the key nothing. I put the old PCM back in and same problem. Wires look good on battery. I also beat on the starter. Any help would be greatly appreciated. Thanks
 

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Program PCM

Most Mopar PCM's are NOT plug and play, they will not work just being plugged into the vehicle. It needs to be programmed. A jeep dealer can do it, or find a local company that works on PCM's. Also, there is a learning curve for the PCM in the vehicle.
It is unlikely a new problem with the starter or ignition circuit has arisen since you changed out the PCM.
 
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