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[Dragonlady2]

Sounds like he may be using the screaming to get your attention. Quakers like to make nests. Does he have some shredded paper, small sticks etc that he could use if he wants to try and build a nest. Search the internet for Quaker nest building. They are amazing.
Make sure he has lots of toys in his cage to keep him occupied. Swap them out daily so he stays interested.

Birds will scream if they are bored and they expect their flockmate (you) to pay attention to them.
If he screams when you are out of the room, try whistling to him. He may learn to whistle back.