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my iphone is not showing apple logo i pressed home button and lock key but still its not showing apple logo plz guide me

A common thing with replacement screens is the LCD ribbon cable popping loose. If that is the case, battery needs to be unplugged when replugging LCD cable.

Did you recently drop it? Could something have come loose? I would plug it in and leave it overnight and see if that works. It could just be very dead. Also, plug it into a computer, see if it is recognized. Then we can tell if it’s screen or phone. If that doesn’t work, let me know