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I am sorry that you have not been helped yet. I just came online and saw your question.
Ok, to properly reset the systems, you need to disconnect both battery cables and clamp their ends together for 10 minutes, then unclamp and reconnect both cables
correct. this is what discharges the capacitors and resets the controls modules to factory parameters without use of a scan tool
Did the new dvd go in easily or did you have to force it in?
Ok, I misunderstood. I assumed you were able to install the new dvd. That means that there is an internal issue with the dvd loader or laser being off its track that runs it.
The radio will likely just need the security code inputted. It should be on a card in your owners manual
The ac is tied in with the navigation system circuit wise and will work when the navigation system is restored.