Fully developed chicks dying in egg... why?

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: We have a bunch of peafowl eggs in an incubator, with automatic turners. A few we due to hatch out about 5 days ago, but we had given up on them since it was so late. But thursday night, in : the middle of the peahen trama, someone went down and checked the extra incubator (where the eggs that were near to hatching had been moved to) and one of the eggs that was 3 day overdue had a small pip in it. However, when we checked the next morning it had died without getting any further. : When my father checked the eggs, the one that had started was fully developed, not deformed at all, and had absorbed all the nutrients out of the eggs. We also had another egg that has gotten almost fully to term and died approximately 3 days before hatching time. Does anyone have any suggestions why and what is going wrong, and what we could do to fix it? I'm very frustrtaed, and keep telling my father we need to get some chicken hens to set on the eggs... He loves tinkering with the incubators, but we've had horrible luck so far so i think he finally agrees with me.

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