I purchased an older Macbook, and it appears my hard drive crashed, so I purchased a new one, and I am trying to get an operating system loaded back on it. A friend had a grey disk from apple, that came with her newer Macbook. I keep getting the Mac OS X can't be loaded on this computer error. I saw Something mentioned about a white disk, from the Apple store. What operating system can I load on this machine as it originally came with Tiger. Any help appreciated.