Had same problem after kids plugged and unplugged and yanked the cable. The port is very delicate and easy to replace. New ports are on eBay for about a fiver and dead simple to replace. Remove back and a couple of screws remove and replace cable job done.

My screen went blank twice on two occasions and both times I've removed the screen tape connection and battery. Remove battery first didn't work. It would appear on both occasions the tab had been dropped or banged and the battery seams to pull the screen tape from the connector because I could see the line to which the tape position should be and it wasn't true to the connector. P.s used finger nails to gently remove back cover.