Macworld Whether you’re planning to buy a new Mac or you got one as a gift, your current Mac doesn’t need to end up in a closet. So what do you do with it? If you aren’t planning to give it to a lucky friend or family member, you can trade or sell it to help pay for that new Mac. Here’s how to get every last bit of value out of your old Mac. Apple has a support document that has good instructions on what you should dobefore you sell, give away, or trade in your Mac and we also discuss how to prepare an old Mac for sale in a separate article. But we have some experience in that department that …