Installed new power port and Tablet won't turn on, why?

We changed the power charging port following your directions. Great install instructions and no problems. Tablet displayed large green android icon and message "downloading, don't turn off target device." In upper left, displayed message regarding "odin mode." After looking for the answer to that situation, we allowed the battery to completely discharge, then recharged to 100%. Tried holding the power and volume simultaneously. No luck. Still won't reboot and only image now is the full battery. Do you have any suggestions?