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You need two keys minimum programed to the vehicle for it to start. I you only have one, it will not start. You will need to get a second key cut and programed to the vehicle. Both keys will need to be programed at the same time.
So you have 4 keys that now fit the ignition cylinder that is now in the vehicle?
Ok, that will not work with the PATS system. He will need to erase all the keys, make one more key and program the 2 new keys at the same time.
See if he can also clear all the trouble codes in the PCM after he does that.
Have him check for trouble codes before he wipes anything.