So I have a brand new White Unibody Macbook, with the new charger. I then have an old, white original Macbook. The new charger will not work with the old Macbook, but I can't seem to find anything about this issue from searching. Anyone else have this problem? The old Macbook works fine with its own charger, but not the new one. The light's don't light up, and it doesn't say its charging the battery based on the menu bar icon. Any input?