I apologize if this has been answered somewhere else. I have been searching for about 6 - 7 hours and can't find what I'm looking for. I have a mid 2009 Macbook Pro 5,5 that I want to keep but share access with other people. I would like to do a complete wipe of my machine then install Mavericks for all of us to use. My laptop came with Leopard install DVD with Snow Leopard upgrade DVD. I am currently using Mavericks. I've tried installing from Leopard DVD but it will only take me to a blank grey screen. I've not tried reformatting my hard drive. Before I do that I'd like to know a couple of things. If I erase my hard drive will I be able to reinstall from my Leopard factory install disc? Will I then be able to upgrade to Mavericks? I downloaded it from the App Store. Thank you for any help you can give me.