| | button on board
I was able to lift the button off of the motherboard by careful use of a scalpel blade. the "button is a domed piece of thin plastic with a metal contact in the dome and another metal contact on the motherboard. Both contacts were perfectly clean and free of corrosion. Therefore the problem is in the structure of the plastic button portion or there is yet another contact below the first set that has a problem. In any case, I have no other ideas and am giving up on fixing this.