For about a month now, every now and then my Macbook turns itself on, when I plug in the power cord to it. It doesn't happen all the time, but let's say about 60-70% of the time. Also, when I am charging its battery, when it is charged to about 60%, it also turns itself on... It turns itself on even when the cover is closed. I am always choosing the "shutdown" option, when closing the computer. I don't have any restart on powers failure options selected. I don't remember it clearly, but I think it started happening, when I upgraded to Leopard... Not sure if this can be the cause?