原帖由： jayeff ,
@Ejim Malachi Try starting the tablet in [https://www.verizonwireless.com/support/knowledge-base-180025/|safe mode] and check if it works OK. If it does a "downloaded" app is the cause of the problem. If still no good use a magnifying glass and a strong light to visually inspect the USB port to make sure that there is no dust or lint trapped in the enclosure and that ALL the pins (5) are there, (especially pin 4 as this is the 'sense" lead) and that they are straight and parallel with each other. If there is anything trapped in the port enclosure preventing a good electrical connection, do not use a metal pin or probe to get it out, use a wooden toothpick or suitable plastic probe to gently pry out the obstruction.