![]() ![]() 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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