I just bought a used MacBook (white version) and I want to upgrade to Mountain Lion, but it won't let me, I am computer ignorant and this is my first Mac, how do I get this done? What do I need to upgrade?
Well, it can't be changed or upgraded (the previous replies are pretty clear), so whether it's a deal-breaker or not is up to you. One question though .... why not just get a brand-new Mac? This way you get the latest and best, along with all the support, warranty, etc.