If the chick is dry and fluffy I would take him out and get him into the brooder. If you put the other eggs to your ear, can you hear anything? Tapping or scraping noise?
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There are soooo many variables that could affect them, quick changes in temp when opening the bator, changes in humidity, shock...... on and on. Sorry your hatch was not more successful. I did not read back through the thread and I expect you answered this already but what kind of bator are you using?