I have a g4 iBook logic board that is completely unresponsive. I can see no physical damage to the board. I believe he problem is not the dc-in board because (1) I get a green light with no battery attached and an orange one when a battery is charging; and (2) it behaves the same way with two different dc-in boards. Neither of two power buttons nor jumpering the pins will get a response from the board. What else is there to try? I hate to recycle it if I can get some more mileage out of it. Thanks for whatever help you can give.