Use Recovery Disk Assistant to create a bootable USB device and boot the new Mac from it by holding down the C key at the startup chime. If you already own another Mac that was upgraded in the App Store to the version of OS X that you want to install, and if the new Mac is compatible with it, then you can install it. Release the keys when you see a spinning globe. It should boot into Internet Recovery mode when you hold down the key combination option-command-R at the startup chime. If the machine shipped with OS X 10.7 or later, you don't need media. Release the key when you see the gray Apple logo on the screen. To boot from an optical disc or a flash drive, insert it, then reboot and hold down the C key at the startup chime. A retail disc, or the gray discs from another model, will not work. You should have received the media from the previous owner, but if you didn't, order replacements from Apple. For early MBA models, you may need a USB optical drive or Remote Disc. If the machine shipped with OS X 10.6, you need the installation media that came with it: gray installation discs, or a USB flash drive for some MacBook Air models. Preferably, install as much memory as it can take, according to the technical specifications. If the machine has less than 1 GB of memory, you'll need to add more in order to install 10.6. If the machine shipped with OS X 10.4 or 10.5, you need a boxed and shrink-wrapped retail Snow Leopard (OS X 10.6) installation disc from the Apple Store or a reputable reseller - not from eBay or anything of the kind. Then find the model on this page to see what OS version was originally installed.
If you're not sure of the model, enter the serial number on this page.
How you do it depends on the model, and on whether you already own another Mac. You - not the previous owner - must do that. The first thing to do with a second-hand computer is to erase the internal drive and install a clean copy of OS X.
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