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really need more info than what's given to give you a concrete answer.
I'm going to ignore talking for now. Short summary for speaking not all CAGs like to talk, they'll only talk if they want to, some prefer mimicking random noises, others never mimic any noise.
How old is he?
Is he a adoption with any background or is he a bought bird?
Do you know if his previous family was abusive or loving?
have you been sat talking to him?
How are you approaching his step-up? Do you offer him the opportunity with an immediate reward in sight for him? OR do you just shove your hand in front of him? He most likely doesn't understand what you want, also parrots especially CAGs are extremely opinionated.
for the time being read these threads over and over aloud until your throat hurts, then give another read of them. They should help you figure out your parrot and how to approach them, just always remember they are far from animals like dogs who want nothing more than to please us. For a parrot we have to please them!
http://www.parrotforums.com/congo-timneh-greys/59366-cag-101-a.html
http://www.parrotforums.com/general-parrot-information/3100-bond-forming.html
http://www.parrotforums.com/general-parrot-information/49144-tips-bonding-building-trust.html