I just purchased a 2010 Mac Mini off eBay really cheap because he says it needs a new hard drive. He decided this because when he was attempting to put a fresh install of Mountain Lion on it and give it to a family member he gets the message from the App Store saying "This Item Is Temporarily Unavailable. Try Again Later." He said he took it to a specialist and they said it was the hard drive. My question is, could it possibly be that Mountain Lion wasn't purchased on whatever Apple ID they were using and that is why he is getting this message and the hard drive is fine? I bought a new SSD for when it comes just in case but if now I will use that elsewhere.