Give them more time! Are you quarentining them? They NEED to be quarentined, just in case the new (or old!) bird is sick, but not yet showing signs. Usually lasts a month to a montha nd a half.
It will also give them a chance to get to chirp to each other, and get curious.
Some birds may just not like each other.
Once you are done quarentining, try playing with them together, give them bothtreats. The birds will need to work out their pecking order- it is you, then usually the old bird, then the new. The old bird will want to assert him domination usually, so it they get into minor 'beak fights' and don't hurt each other, let them. If they become too agressive, seperate them.
Sorry i couldn't help more...
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