This guy has some interesting things on his site... I know nothing about the company or the products. http://www.mikegyver.com/IdeasnProducts/Kensington-Magsafe/ I have a pc that I use through a targus dc power supply. They don't have one for mac that I could find. A phone call to their excellent customer service might tell you if they have a work around for the mac patent. Linda Vanaman MERCY