Macbook will not start up with power cord plugged in

hi,
my macbook core duo, wont startup anymore with the power cord.
It does work with a battery though. But the problem is that the cord is not charging the battery anymore and not even giving power to the machine.
the light on the cord is green. I tried with another power cord, it does the same.
i even changed the dc-in board, with no luck.
any ideas ?

I have the exact same problem. There is a buzz from the region where the power connection is, and I'm afraid it is a power hardware issue. Since the optical drive already quit on this first gen MacBook, I think it's time to chuck this lemon.

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Macbook will not start up with power cord plugged in

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