I currently have a 2010 MacBook HD inside a Mid-2012 MBP. It was running Yosemite. I've wiped the HD with Disk Utility and using Recovery Mode installed Mountain Lion so it's running as a new machine. I have inserted a Snow Leopard Install Disk into the computer and I'd like to know what steps I have to take to get the computer to run it. I need it to run some PPC stuff.