Hello. I inherited an old Macbook Pro 17" from my father. A1212 to be exact. I want to get OSX on it. I understand I can't upgrade it fully, but I want to use the latest possible OS. I am using a different hard drive than it came with. It's a 750 GB HDD. I believe the operating system that came with it is 10.4.8, and it should be able to be upgraded to 10.7.5. Does that mean I should acquire an installer for 10.4.8, or can I start with 10.7.5? The CD drive does not work, but the USB ports do. I have a USB drive with plenty of space, so if I made an installer disk from it, everything should work okay, right? I could also access the new hard drive with a SATA adapter, and use my main laptop to create an installer disk out of that, right? I may have answered all of my own questions but I would like to be sure. Thanks everyone!