A retail Snow Leopard DVD won't work on that Mac. Phone Apple and order replacement original disks; if you've made an USB installer from the Mac App Store version of 10.7 or newer, you can use that instead. The computer's exact specifications, including its original OS and the answer as to whether or not the retail DVD would have worked. Currently only available in Mac OS X 10.6 'Snow Leopard', Mac OS X 10.7 'Lion', and OS X 10.8 'Mountain Lion' Added Support to Install ISO files from USB; 5.0.5033: March 14, 2013 Support for Windows 8 and Windows 8 Pro (64-bit only) Boot Camp support for Macs with a 3 TB hard drive; Drops support for 32-bit Windows 7.

1. It isn't possible to tell whether or not a retail Snow Leopard DVD will work based only on A1278. Append the last three characters of the computer's serial number to http://www.everymac.com/ultimate-mac-lookup/?search_keywords= and load the page.

2. If you can use that DVD, it'll have all the OS components on one, but not iLife.

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3. Insert it, restart the computer with the C or Option key held down, use the Disk Utility to erase the internal drive, and install the OS.

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Feb 7, 2015 10:02 PM