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I recently replaced my iphone screen and i didn’t put all the screws in, but it still turned on to the apple logo then off. The apple logo kept going on and off all day and without turning the phone off i opened it. after that the phone wouldn’t turn on. I just put all the screws in but it still doesn’t turn on and isn’t recognized by itunes. Please help, what should i do?

Have you checked to ensure that the battery connector hasn’t become loose or dislodged? Have you tried a hard reset of the iPhone by holding the power and home button for several seconds? Does the iPhone still charge when connected to a regular outlet?