Against my advice, my sister bought a used 2006 macbook (white).

There is no operating system and I have no clue where/how and which version to get (I am not a mac person) help?

Thank you!

tell her to take it back and buy a new one?

No, that's a ridiculous "solution" and it doesn't nearly answer my question.

That is the kind of "answers" that render these websites useless.

Well did you google the solution? And doesn't it have the itunes/app store feature where you can buy mountain lion?

There is no operating system in the hard drive kid. No operating system, no itunes. My cousin just lend me the OS disks for his macbook so problem solved.

Congratz for you :)