Hello, I bought a used Macbook Pro. When I power the unit on it takes me straight to disk utility screen. I think the person who had it before me wiped the OS. The Macbook Pro is a 2009 model and I found out the original OS X was 10.5.7. My question is this, what options do I have about installing a new OS on the machine? Sadly I do not have any installation disks. I have never owned or worked on a Mac before. I have on many occasions used Windows Loader by DAZ to install Windows OS on PC's before. Is there something similar for OS X? Thanks for any information.