Well, I'm no expert, but my mac had the same problem. I took it in to the local apple experts (not apple store) and they said something about the motherboard wasn't working right. My warranty was up so they said "Well, you can fix this, but it'll cost more than the computer (The computer was a $200 ibook off ebay lol) Or you could get this 2 GHz Macbook for $500, plus 1 GB of extra RAM for trading in your broken ibook" and I was thinking MACBOOK!!!!!!! So I guess it might be an unfixable problem. Mine was like yours; Charging symbol wouldn't show up, but the light on the charger was yellow. When I really pushed on the charger, it turned green and charged. Probably ur motherboard dude.