After performing the diagnostic, I found that the system was completely empty on R-410A refrigerant. I pressure tested the system and looked for a leak however I could not locate the leak on the indoor or outdoor system. I informed the customer and he said he would just like to add the refrigerant at this time. After recharging the system everything is coming on and cooling at this time. It is my assumption that the lightning could have damaged the refrigerant lines themselves. I can't confirm that without an isolation leak search. The customer wants to wait and see if that's necessary.