So you did not allow the parents to raise this chick for the first week or two, but rather you have been attempting to feed it from the day it hatched? What implement did you use at first to try to feed him (syringe, spoon, etc.)? How long did you wait after the chick first hatched to give him his first formula feeding? And what formula have you been using from the start?
Whenever a parrot chick has absolutely no feeding-response at all, it typically has to do with either a neurological issue (#! reason), or it has to do with certain chicks not being fed by their mother/father for the first two to three weeks before being pulled. It's extremely common for this to happen whenever a human attempts to hand-feed a chick from the moment of hatching. It can also be caused by a human trying to feed the chick too soon after hatching. Most species of parrots (not all, but most) wait at least 24 hours before feeding their newly-hatched babies for the first time, and if we as people don't wait and try to immediately feed them, or feed them too soon after hatching, then this can be the result. Also, it's ill-advised to start feeding a chick until they are at least 2 weeks old, but no older than 3 weeks old, as parrots do in-fact provide their newly-hatched chicks with a form of "crop-milk", which provides the baby chicks necessary antibodies and antigens to build their immune systems. Think of the mother's first feedings as a type of "colostrum"...So when a person starts feeding a chick from the start, they are automatically depriving the chick of this very important and much needed immunity-builder, and for these reasons it's best to ALWAYS wait until the chick is at least 2 weeks old, unless there is no choice, like the chick has been refused by the mother, the mother dies, etc.
It's more than likely that your chick is suffering from a neurological/developmental issue, as is usually the case with a chick that has never had any feeding response...And tube-feeding a chick, though sometimes necessary, usually also causes a whole lot of issues, both physical/health related as well as psychological...Chicks that are tube-fed never learn what "taste" is, as they never get to taste their food, so therefore they never form the mental connection between food and enjoyment, and often times they just fail to ever eat, and often suffer from malnutrition, undernutrition, nutritional deficiencies, etc. Often these birds have to be tube-fed for the rest of their lives, because they don't realize that they are hungry, nor do they realize that they need to eat to survive, as they lack this particular drive of survival...The longer they are tube-fed, the more likely they are to never understand what being "hungry" is, or how to make the feeling go away. They don't like to eat, they think of it as forever a negative experience, and basically their owners must force-feed them formula by tube-feeding them every single day for the rest of their lives...
