I reformatted my HDD and want to install a clean copy. I did not back it up because it was my sisters and wanted to start over. I have read forums regarding how to do this. I have held down the ALT key and the option (only option) to choose install disc. I choose it and then the Apple symbol comes up and doesn't go away. Install disc is not being read and the HDD is not moving. I want this for my daughter who is entering HS. How can I get this installed? I spent a few hours on it and am frustrated. It worked when my sister used it now I cant get OS to install. I have always been a PC user and have built, installed and reformatted many of them. Apple is just a different kind of animal I am trying to learn. Thanks for any help.