Whenever my laptop is plugged in, if I very softly touch/rub the left side of the aluminum where the laptop plugs in, I can feel almost a slight abnormal vibration that makes my fingers tingle. It actually feels like the laptop isn't properly grounded and the aluminum is giving off some sort of electric noise? (not sounds) I can't explain it but I can only feel it when it's plugged in. If I press firmly I don't feel it at all, but if I ever so slightly touch it, I can definitely feel something's not right. Doesn't happen on the right side. Anyone have any ideas?