I have a Toshiba laptop that is giving me some pretty good fits. The external power plug isn't working. When you plug the power into the back of the computer,it is very sensitive to pressure and exact placement in the jack. It really only responds to charging when the computer is turned ogg. In other words, if the computer is on, I cannot get it to run from external power. And when it is off, it is very difficult to get it to charge. Anybody have experience with this? Any suggestions? Thanks in advance.