We've been stumped by the following scenario with our Macbook running Leopard. When we use the computer it runs on battery power and shows the 'not charging' sign even if it is plugged in and the Mag shows green. The battery shows 'Normal'. When we shut the lid the battery charges, but only when the lid is shut. Any thoughts on how to "fix" the issue to allow the computer to recharge while we are using it?