I can only get Windows to install on my Macbook. All other Mac os form 10.3-10.5 it just spits out the disc. I got it from a guy on ebay with leopard on it. I tried to use bootcamp to install windows. The windows install would not work so I tried to go back to 10.5. It would not boot into 10.5. No it spits out disc and claims it can't find boot disc. But it will install linux or windows. I have reset pram. Is there a way to reset the efi? What do I do?