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It really does sound like a USB port issue. On mine, if I insert an unconnected USB cable, it does nothing, however, if I plug in a USB charger, it pops up the USB connected screen, yet does nothing except drain the battery. It is possible that either one of the USB pins is damaged, or something inside shorted or came loose.
You could probably map out the pins with a multimeter to see if anything is active. I don't know how they work, I always get my dad to check circuits for me.
¡Buena suerte!
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