It's the late 2011 MBP 13 inch model, and it's on OS X lion. Question: How do I reset/format it? And If I reset it will I lose my free upgrade to Yosemite? As in the Mac will restore itself to a very old OS X, that I'm no longer eligible to download Yosemite and have to pay for an inbetween upgrade before downloading Yosemite? Or should I upgrade to Yosemite THEN reset/format it? The original owner has no idea how to use a Mac (which is why he's selling it after 2 weeks) and he told me he doesn't know how to format it. And do I really need installation discs? I heard Macs can be reset without any installation media, you just wipe the HDD, connect to the internet then re-install. That makes the included recovery discs seem pointless, no? (I forgot to ask him if recovery discs came with his Mac, but I've googled it and I think it should come with it, not sure) I'm new to Mac, so please help me out.