It's unsafe, and may be unlawful, to use a computer with software installed by a previous owner.Ī. 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 go about it depends on the model, and on whether you already own another Mac. Changes made by Apple over the years have made this seemingly straightforward task very complex. The first thing to do after buying the computer is to erase the internal drive and install a clean copy of OS X. Before buying a second-hand computer, you should have run Apple Diagnostics or the Apple Hardware Test, whichever is applicable.
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