how to do a factory reset
how do I wipe and do a complete factory Reset on a Mac book air
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Click here and follow the instructions. If the computer originally shipped with Mac OS X 10.6.8 or earlier, when you reach step 6, insert a compatible Mac OS X install DVD or connect its installation thumbdrive, restart with the C or Option key held down, use the Disk Utility to erase the internal drive, and install a fresh OS.
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