Ahhhh FAIL! I guess the disk I was going to use wasn't official. As I began the installation, I was brought to a black screen that said insert the disk and press a button. I reinserted the disk but it wouldn't have it. So I called it quits and rebooted, but it kept coming back to the same screen. So I rebooted again and held the Option key and chose Mac. I was taken back to my regular stuff and it went good. But now, every time I start up, it takes me to the black screen again. I don't want to have to keep holding the Option key, so how can I get rid of the black screen?